MIPS: Netlogic: Core wakeup changes for XLP2XX

On XLP2xx, wakeup code does not need to enable clock on the core.
Update xlp/wakeup.c to handle this.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5703/


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