MIPS: Netlogic: add device tree entry for XLP GPIO

Add GPIO entries to the Netlogic XLP device tree files.

Signed-off-by: Kamlakant Patel <kamlakant.patel@broadcom.com>
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10819/


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