drm/amdgpu/vcn: remove duplicate mask

Looks like a copy past issue.
Reported-by: NJulia Lawall <julia.lawall@lip6.fr>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c

@@ -373,7 +373,6 @@ static void vcn_v1_0_disable_clock_gating(struct amdgpu_device *adev, bool sw)
 		| UVD_SUVD_CGC_GATE__SCM_MASK
 		| UVD_SUVD_CGC_GATE__SDB_MASK
 		| UVD_SUVD_CGC_GATE__SRE_H264_MASK
-		| UVD_SUVD_CGC_GATE__SRE_H264_MASK
 		| UVD_SUVD_CGC_GATE__SRE_HEVC_MASK
 		| UVD_SUVD_CGC_GATE__SIT_H264_MASK
 		| UVD_SUVD_CGC_GATE__SIT_HEVC_MASK