octeon: remove the now redundant cpu cflags override

The flags are now properly defined in include/target.mk

Signed-off-by: Yousong Zhou <[email protected]>

target/linux/octeon/Makefile

@@ -11,7 +11,6 @@ BOARD:=octeon
 BOARDNAME:=Cavium Networks Octeon
 FEATURES:=squashfs ext4 initramfs pci usb
 CPU_TYPE:=octeon
-CPU_CFLAGS_octeon:=-march=octeon -mabi=64
 MAINTAINER:=John Crispin <[email protected]>
 
 KERNEL_PATCHVER:=4.4