lib/debugfs: Don't do CRC sanity checks on amdgpu

A black FB on amdgpu returns a CRC of (0, 0, 0), which IGT considers
suspicious. All our CRC values are also 16-bit so a value of 0xffffffff
can't be obtained.

Drop the suspicious CRC checks on amdgpu by checking the device in
crc_sanity_checks. We need the drm_fd for this so pass in pipe_crc
to the function to get it. It makes more sense to me to do it this
way than to duplicate code and the explanation on both calls to
crc_sanity_checks.

v2: rebase

Cc: Leo Li <sunpeng.li@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>

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