video: clps711x: Fix sparse warnings

This patch fixes below warning:

  drivers/video/fbdev/clps711x-fb.c:314:17: warning: incorrect type in initializer (different address spaces)
  drivers/video/fbdev/clps711x-fb.c:314:17:    expected void *__p
  drivers/video/fbdev/clps711x-fb.c:314:17:    got char [noderef] <asn:2>*screen_base
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/fbdev/clps711x-fb.c

@@ -311,7 +311,7 @@ static int clps711x_fb_probe(struct platform_device *pdev)
 		/* Setup start FB address */
 		writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR);
 		/* Clean FB memory */
-		memset(info->screen_base, 0, cfb->buffsize);
+		memset_io(info->screen_base, 0, cfb->buffsize);
 	}
 
 	cfb->lcd_pwr = devm_regulator_get(dev, "lcd");