This allows us to use the r2 optimized code from kernel headers
while compilation.

Disable PGD_C0_CONTEXT option for XLP, which does not work.
Signed-off-by: NJayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4456Signed-off-by: NJohn Crispin <blogic@openwrt.org>