ARM: imx: use imx specific L2 init function on imx6sl

The optimized L2 prefect and power setting done in imx_init_l2cache()
can also benefit imx6sl, so let's call the function on imx6sl as well.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Dirk Behme <dirk.behme@de.bosch.com>

arch/arm/mach-imx/mach-imx6sl.c

@@ -11,7 +11,6 @@
 #include <linux/irqchip.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
-#include <asm/hardware/cache-l2x0.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 
@@ -26,7 +25,7 @@ static void __init imx6sl_init_machine(void)
 
 static void __init imx6sl_init_irq(void)
 {
-	l2x0_of_init(0, ~0UL);
+	imx_init_l2cache();
 	imx_src_init();
 	imx_gpc_init();
 	irqchip_init();