MIPS: Netlogic: Fix XLP9XX pic entry

Add the compatible property to the PIC entry. Also fix up the nodename
to use the correct address.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6869/


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