zipitz2: enable caches

It speeds up loading kernel from SD or USB a lot.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Marek Vasut <marex@denx.de>

board/zipitz2/zipitz2.c

@@ -30,10 +30,6 @@ inline void lcd_start(void) {};
  */
 int board_init(void)
 {
-	/* We have RAM, disable cache */
-	dcache_disable();
-	icache_disable();
-
 	/* arch number of Z2 */
 	gd->bd->bi_arch_number = MACH_TYPE_ZIPIT2;