drm/radeon: Always disable RADEON_GEM_GTT_UC along with RADEON_GEM_GTT_WC
[ Upstream commit a28bbd58 ] Write-combining is a CPU feature. From the GPU POV, these both simply mean no GPU<->CPU cache coherency. Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
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