MLK-10448-2 mx6: L2cache: Enable the double line fill for i.MX6DQP

Since i.MX6DQP has fixed the L2 cache issue, enable the double line
fill feature to provide better performance.

Signed-off-by: Ye.Li <B37916@freescale.com>

arch/arm/mach-imx/cache.c

@@ -127,6 +127,9 @@ void v7_outer_cache_enable(void)
 
 #ifndef CONFIG_MX6Q
 	val |= 0x40800000;
+#else
+	if (is_mx6dqp())
+		val |= 0x40800000;
 #endif
 	writel(val, &pl310->pl310_prefetch_ctrl);