ipq806x: add patch for kernel compiler flags

Signed-off-by: Josh Bendavid <joshbendavid@gmail.com>

target/linux/ipq806x/patches-4.4/801-override-compiler-flags.patch

@@ -0,0 +1,13 @@
+diff --git a/arch/arm/Makefile b/arch/arm/Makefile
+index 2c2b28e..64c037d 100644
+--- a/arch/arm/Makefile
++++ b/arch/arm/Makefile
+@@ -67,7 +67,7 @@ KBUILD_CFLAGS	+= $(call cc-option,-fno-ipa-sra)
+ # macro, but instead defines a whole series of macros which makes
+ # testing for a specific architecture or later rather impossible.
+ arch-$(CONFIG_CPU_32v7M)	=-D__LINUX_ARM_ARCH__=7 -march=armv7-m -Wa,-march=armv7-m
+-arch-$(CONFIG_CPU_32v7)		=-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a)
++arch-$(CONFIG_CPU_32v7)		=-D__LINUX_ARM_ARCH__=7 -mcpu=cortex-a15
+ arch-$(CONFIG_CPU_32v6)		=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6)
+ # Only override the compiler option if ARMv6. The ARMv6K extensions are
+ # always available in ARMv7