drm/amdgpu: add need_reset_on_init asic callback (v2)

Used to determine if we need to reset the asic on init due
to the driver having been previously loaded or not shutdown
cleanly.  E.g., kexec or VM passthrough.

v2: rebase

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>