drm/amdgpu/dc: fix DCN3.1 Makefile for PPC64

Port the necessary changes from previous DCN versions.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2021-06-04 13:45:51 -04:00
commit df7a1658f2