drm/amd/include: cleanup vega10 umc header files.

Remove asic/vega10/UMC folder.
Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -36,7 +36,7 @@
 #include "athub/athub_1_0_offset.h"
 
 #include "soc15_common.h"
-#include "vega10/UMC/umc_6_0_sh_mask.h"
+#include "umc/umc_6_0_sh_mask.h"
 
 #include "nbio_v6_1.h"
 #include "nbio_v7_0.h"