feat(disp) add drv_update_cb to detect rotation/other parameter changes

src/lv_hal/lv_hal_disp.c

@@ -198,6 +198,8 @@ void lv_disp_drv_update(lv_disp_t * disp, lv_disp_drv_t * new_drv)
     disp->inv_p = 0;
     if(disp->act_scr != NULL)
         lv_obj_invalidate(disp->act_scr);
+
+    if(disp->driver.drv_update_cb) disp->driver.drv_update_cb(&disp->driver);
 }
 
 /**

src/lv_hal/lv_hal_disp.h

@@ -126,6 +126,9 @@ typedef struct _disp_drv_t {
     /** OPTIONAL: called to wait while the gpu is working */
     void (*gpu_wait_cb)(struct _disp_drv_t * disp_drv);
 
+    /** OPTIONAL: called when driver parameters are updated */
+    void (*drv_update_cb)(struct _disp_drv_t * disp_drv);
+
 #if LV_USE_GPU
 
     /** OPTIONAL: Blend two memories using opacity (GPU only)*/