MIPS: Netlogic: No need to set -Werror in mips/xlr

The -Werror compilation flag is already set for arch/mips - it can be removed
from arch/mips/xlr/Makefile
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2963/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/netlogic/xlr/Makefile

 obj-y				+= setup.o platform.o irq.o setup.o time.o
 obj-$(CONFIG_SMP)		+= smp.o smpboot.o
 obj-$(CONFIG_EARLY_PRINTK)	+= xlr_console.o
-
-ccflags-y			+= -Werror