drm/amdgpu: Remove duplicated argument in vcn_v4_0

Fix following coccicheck warning:
./drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c:724:4-36: duplicated argument to & or |

Remove duplicated UVD_SUVD_CGC_GATE__SRE_H264_MASK.
Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c

@@ -722,7 +722,6 @@ static void vcn_v4_0_disable_clock_gating(struct amdgpu_device *adev, int inst)
 		| 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