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

arch/mips/loongson/lemote-2f/reset.c

@@ -76,7 +76,7 @@ static void fl2f_shutdown(void)
 
 /* reset support for yeeloong2f and mengloong2f notebook */
 
-void ml2f_reboot(void)
+static void ml2f_reboot(void)
 {
 	reset_cpu();