KVM: arm64: Don't use has_vhe() for CHOOSE_HYP_SYM()

The recently introduced CHOOSE_HYP_SYM() macro picks one symbol
or another, depending on whether the kernel run as a VHE
hypervisor or not. For that, it uses the has_vhe() helper, which
is itself implemented as a final capability.

Unfortunately, __copy_hyp_vect_bpi now indirectly uses CHOOSE_HYP_SYM
to get the __bp_harden_hyp_vecs symbol, using has_vhe() in the process.
At this stage, the capability isn't final and things explode:

[    0.000000] ACPI: SRAT not present
[    0.000000] percpu: Embedded 34 pages/cpu s101264 r8192 d29808 u139264
[    0.000000] Detected PIPT I-cache on CPU0
[    0.000000] ------------[ cut here ]------------
[    0.000000] kernel BUG at arch/arm64/include/asm/cpufeature.h:459!
[    0.000000] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.8.0-rc4-00080-gd630681366e5 #1388
[    0.000000] pstate: 80000085 (Nzcv daIf -PAN -UAO BTYPE=--)
[    0.000000] pc : check_branch_predictor+0x3a4/0x408
[    0.000000] lr : check_branch_predictor+0x2a4/0x408
[    0.000000] sp : ffff800011693e90
[    0.000000] x29: ffff800011693e90 x28: ffff8000116a1530
[    0.000000] x27: ffff8000112c1008 x26: ffff800010ca6ff8
[    0.000000] x25: ffff8000112c1000 x24: ffff8000116a1320
[    0.000000] x23: 0000000000000000 x22: ffff8000112c1000
[    0.000000] x21: ffff800010177120 x20: ffff8000116ae108
[    0.000000] x19: 0000000000000000 x18: ffff800011965c90
[    0.000000] x17: 0000000000022000 x16: 0000000000000003
[    0.000000] x15: 00000000ffffffff x14: ffff8000118c3a38
[    0.000000] x13: 0000000000000021 x12: 0000000000000022
[    0.000000] x11: d37a6f4de9bd37a7 x10: 000000000000001d
[    0.000000] x9 : 0000000000000000 x8 : ffff800011f8dad8
[    0.000000] x7 : ffff800011965ad0 x6 : 0000000000000003
[    0.000000] x5 : 0000000000000000 x4 : 0000000000000000
[    0.000000] x3 : 0000000000000100 x2 : 0000000000000004
[    0.000000] x1 : ffff8000116ae148 x0 : 0000000000000000
[    0.000000] Call trace:
[    0.000000]  check_branch_predictor+0x3a4/0x408
[    0.000000]  update_cpu_capabilities+0x84/0x138
[    0.000000]  init_cpu_features+0x2c0/0x2d8
[    0.000000]  cpuinfo_store_boot_cpu+0x54/0x64
[    0.000000]  smp_prepare_boot_cpu+0x2c/0x60
[    0.000000]  start_kernel+0x16c/0x574
[    0.000000] Code: 17ffffc7 91010281 14000198 17ffffca (d4210000)

This is addressed using a two-fold process:
- Replace has_vhe() with is_kernel_in_hyp_mode(), which tests
  whether we are running at EL2.
- Make CHOOSE_HYP_SYM() return an *undefined* symbol when
  compiled in the nVHE hypervisor, as we really should never
  use this helper in the nVHE-specific code.

With this in place, we're back to a bootable kernel again.

Fixes: b877e984 ("KVM: arm64: Build hyp-entry.S separately for VHE/nVHE")
Signed-off-by: Marc Zyngier <maz@kernel.org>