media: nxp: imx8-isi: fix buiding on 32-bit

The #if check is wrong, leading to a build failure:

  drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c: In function 'mxc_isi_channel_set_inbuf':
  drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c:33:5: error: "CONFIG_ARCH_DMA_ADDR_T_64BIT" is not defined, evaluates to 0 [-Werror=undef]
     33 | #if CONFIG_ARCH_DMA_ADDR_T_64BIT
        |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

This could just be an #ifdef, but it seems nicer to just remove the
check entirely.  Apparently the only reason for the #ifdef is to avoid
another warning:

  drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c:55:24: error: right shift count >= width of type [-Werror=shift-count-overflow]

But this is best avoided by using the lower_32_bits()/upper_32_bits()
helpers.

Fixes: cf21f328

 ("media: nxp: Add i.MX8 ISI driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>