MIPS: Netlogic: nlm_core_id for xlp9xx

XLP9XX has 5 bits that specify the core in the EBASE register. XLP5XX
case added as well for completeness.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8890/


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