drm/amd/display: Remove unused fields from dmub_cmd_update_dirty_rect_data

Drop coasting_vtotal_high and pad from dmub_cmd_update_dirty_rect_data,
since it is not used.
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dmub/inc/dmub_cmd.h

@@ -3028,14 +3028,6 @@ struct dmub_cmd_update_dirty_rect_data {
 	 * Currently the support is only for 0 or 1
 	 */
 	uint8_t panel_inst;
-	/**
-	 * 16-bit value dicated by driver that indicates the coasting vtotal high byte part.
-	 */
-	uint16_t coasting_vtotal_high;
-	/**
-	 * Explicit padding to 4 byte boundary.
-	 */
-	uint8_t pad[2];
 };
 
 /**