drm/amd/amdgpu: add missing umc_6_1_2_sh_mask.h header file (v2)

(v2): Fix preprocessor tag

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed