MIPS: loongson: lemote-2f: reset: make ml2f_reboot static

Make ml2f_reboot static to elimite the following sparse warning:
warning: symbol 'ml2f_reboot' was not declared. Should it be static?

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8528/


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