drm/msm/mdp5: add writeback block bases

In order to stop patching the mdp5 headers, import definitions for the
writeback blocks. This part is extracted from the old Rob's patch.
Co-developed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/585842/
Link: https://lore.kernel.org/r/20240401-fd-xml-shipped-v5-1-4bdb277a85a1@linaro.org

drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.h

@@ -69,6 +69,16 @@ struct mdp5_mdp_block {
 	uint32_t caps;			/* MDP capabilities: MDP_CAP_xxx bits */
 };
 
+struct mdp5_wb_instance {
+	int id;
+	int lm;
+};
+
+struct mdp5_wb_block {
+	MDP5_SUB_BLOCK_DEFINITION;
+	struct mdp5_wb_instance instances[MAX_BASES];
+};
+
 #define MDP5_INTF_NUM_MAX	5
 
 struct mdp5_intf_block {
@@ -98,6 +108,7 @@ struct mdp5_cfg_hw {
 	struct mdp5_sub_block pp;
 	struct mdp5_sub_block dsc;
 	struct mdp5_sub_block cdm;
+	struct mdp5_wb_block wb;
 	struct mdp5_intf_block intf;
 	struct mdp5_perf_block perf;