bcm53xx: add arm l2c overwrite options like in mainline kernel

Instead of setting the l2c_aux_val variable in the board code make it
possible to set these through device tree and make use of that.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 46129

target/linux/bcm53xx/patches-4.1/340-ARM-BCM5301X-Add-profiling-support.patch

@@ -4,7 +4,7 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
 ---
 --- a/arch/arm/boot/dts/bcm5301x.dtsi
 +++ b/arch/arm/boot/dts/bcm5301x.dtsi
-@@ -82,6 +82,13 @@
+@@ -85,6 +85,13 @@
  		};
  	};