MIPS: Netlogic: Cache, TLB support and feature overrides for XLR

CPU_XLR case added to mm/tlbex.c
CPU_XLR case added to mm/c-r4k.c for PINDEX attribute
Feature overrides for XLR cpu.

Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2333/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>