drm/amdgpu: check if we need to reset at init time (v2)

To deal with situations like kexec or GPU VM passthrough
where the device may have been used previously without a
proper GPU reset between.

v2: rebase

bug: https://bugs.freedesktop.org/show_bug.cgi?id=108585
bug: https://bugs.freedesktop.org/show_bug.cgi?id=108754


Reviewed-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>