MIPS: Netlogic: Call xlp_mmu_init on all threads

The config7/config4 register has to be written on all the threads.
This does not cause any problems in XLP, but is needed for XLPII

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5700/


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