bcm53xx: update to kernel 4.1

This makes bcm53xx use kernel 4.1 by default now.

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

SVN-Revision: 46877

target/linux/bcm53xx/Makefile

@@ -13,7 +13,7 @@ FEATURES:=squashfs nand usb pci pcie gpio
 MAINTAINER:=Hauke Mehrtens <hauke@hauke-m.de>
 CPU_TYPE:=cortex-a9
 
-KERNEL_PATCHVER:=3.18
+KERNEL_PATCHVER:=4.1
 
 include $(INCLUDE_DIR)/target.mk