amdgpu: add umc ras inject test configuration

Both umc single_correctable and multi_uncorrectable
inject types are added.

Signed-off-by: Dennis Li <dennis.li@amd.com>
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>