drm/omap: acx565akm: use __be32 when reading status

Fix sparse warning:

drivers/gpu/drm/omapdrm/displays/panel-sony-acx565akm.c:224:23: warning: cast to restricted __be32
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/displays/panel-sony-acx565akm.c

@@ -216,12 +216,12 @@ static void set_display_state(struct panel_drv_data *ddata, int enabled)
 
 static int panel_enabled(struct panel_drv_data *ddata)
 {
+	__be32 v;
 	u32 disp_status;
 	int enabled;
 
-	acx565akm_read(ddata, MIPID_CMD_READ_DISP_STATUS,
-			(u8 *)&disp_status, 4);
-	disp_status = __be32_to_cpu(disp_status);
+	acx565akm_read(ddata, MIPID_CMD_READ_DISP_STATUS, (u8 *)&v, 4);
+	disp_status = __be32_to_cpu(v);
 	enabled = (disp_status & (1 << 17)) && (disp_status & (1 << 10));
 	dev_dbg(&ddata->spi->dev,
 		"LCD panel %senabled by bootloader (status 0x%04x)\n",