drm/amdgpu: Repeat assignment to max_slave_planes

Signed-off-by: ZhiJie.Zhang <zhangzhijie@loongson.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c

@@ -1272,7 +1272,6 @@ static bool underlay_create(struct dc_context *ctx, struct resource_pool *pool)
 
 	/* update the public caps to indicate an underlay is available */
 	ctx->dc->caps.max_slave_planes = 1;
-	ctx->dc->caps.max_slave_planes = 1;
 
 	return true;
 }