Revert "drm/v3d: Improve MMU support for larger pages"

This implementation of MMU support for larger pages doesn't address the
real problem: we are using the system's PAGE_SHIFT (which depends on the
PAGE_SIZE) to allocate the VA.

This implementation is especially problematic when dealing with a high
memory usage, e.g. vkoverhead and RBDOOM-3-BFG, as it can lead to a
kernel crash:

[   72.794493] Unable to handle kernel paging request at virtual address ffffc00009b58000
[   72.802451] Mem abort info:
[   72.805251]   ESR = 0x0000000096000047
[   72.809011]   EC = 0x25: DABT (current EL), IL = 32 bits
[   72.814340]   SET = 0, FnV = 0
[   72.817399]   EA = 0, S1PTW = 0
[   72.820544]   FSC = 0x07: level 3 translation fault
[   72.825438] Data abort info:
[   72.828320]   ISV = 0, ISS = 0x00000047
[   72.832165]   CM = 0, WnR = 1
[   72.835137] swapper pgtable: 16k pages, 47-bit VAs, pgdp=000000000123c000
[   72.841950] [ffffc00009b58000] pgd=100000010018c003, p4d=100000010018c003, pud=100000010018c003, pmd=1000000100190003, pte=0000000000000000
[   72.854530] Internal error: Oops: 0000000096000047 [#1] PREEMPT SMP
[   72.860819] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device algif_hash algif_skcipher af_alg bnep binfmt_misc brcmfmac brcmutil hci_uart cfg80211 btbcm bluetooth aes_ce_blk aes_ce_cipher ghash_ce gf128mul sha2_ce rpivid_hevc(C) pisp_be joydev ecdh_generic sha256_arm64 ecc v4l2_mem2mem sha1_ce videobuf2_dma_contig videobuf2_memops rfkill videobuf2_v4l2 libaes videobuf2_common raspberrypi_hwmon videodev mc pwm_fan rp1_adc raspberrypi_gpiomem nvmem_rmem uio_pdrv_genirq uio i2c_dev fuse dm_mod ip_tables x_tables ipv6 hid_logitech_hidpp hid_logitech_dj vc4 snd_soc_hdmi_codec drm_display_helper cec drm_dma_helper spidev drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops snd_soc_core snd_compress spi_bcm2835 snd_pcm_dmaengine v3d gpu_sched drm_shmem_helper i2c_brcmstb drm snd_pcm snd_timer snd gpio_keys drm_panel_orientation_quirks backlight
[   72.938384] CPU: 1 PID: 1918 Comm: vkoverhead Tainted: G         C         6.1.0-rpi8-rpi-2712 #1  Debian 1:6.1.73-1+rpt1
[   72.949386] Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT)
[   72.955236] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[   72.962222] pc : v3d_mmu_insert_ptes+0xc0/0x154 [v3d]
[   72.967298] lr : v3d_mmu_insert_ptes+0x6c/0x154 [v3d]
[   72.972369] sp : ffffc0000a07bbb0
[   72.975688] x29: ffffc0000a07bbb0 x28: ffffc0000a07bd48 x27: 0000000000000010
[   72.982849] x26: ffffc0000a07bd48 x25: ffff800101d9ca00 x24: 0000000000000042
[   72.990009] x23: ffff800101d9ca00 x22: ffff800100d42000 x21: 0000000000100004
[   72.997169] x20: ffff8001ca4cc000 x19: 0000000000ffffff x18: 0000000000000100
[   73.004330] x17: 0000000000000000 x16: ffffd0000c6434b0 x15: ffffd0000d16c008
[   73.011491] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
[   73.018652] x11: 0000000000000001 x10: 0000000000000000 x9 : ffffcfffde8dc260
[   73.025813] x8 : ffff800100d42700 x7 : 0000000000003fff x6 : ffff8001ca3a1520
[   73.032973] x5 : 0000000000100000 x4 : ffffc00009758000 x3 : 0000000000100000
[   73.040134] x2 : 00000000301ca4cf x1 : 0000000000100001 x0 : 00000000301ca4d0
[   73.047295] Call trace:
[   73.049741]  v3d_mmu_insert_ptes+0xc0/0x154 [v3d]
[   73.054463]  v3d_bo_create_finish+0xd0/0xf0 [v3d]
[   73.059185]  v3d_create_bo_ioctl+0x50/0x150 [v3d]
[   73.063906]  drm_ioctl_kernel+0xd0/0x180 [drm]
[   73.068412]  drm_ioctl+0x214/0x430 [drm]
[   73.072383]  __arm64_sys_ioctl+0xb4/0xfc
[   73.076318]  invoke_syscall+0x50/0x120
[   73.080077]  el0_svc_common.constprop.0+0x4c/0xf4
[   73.084794]  do_el0_svc+0x34/0xd0
[   73.088114]  el0_svc+0x2c/0x84
[   73.091173]  el0t_64_sync_handler+0xf4/0x120
[   73.095454]  el0t_64_sync+0x18c/0x190
[   73.099124] Code: 2a0103e3 11000421 4b050020 0b020000 (b8237880)
[   73.105237] ---[ end trace 0000000000000000 ]---

Signed-off-by: Maíra Canal <mcanal@igalia.com>