MIPS: Loongson64: Remove unused loongson_reboot.

Commit 1bdb7b76 ("MIPS: Loongson64: Cleanup unused code")
left the loongson_reboot unused, delete it.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/loongson64/reset.c

@@ -15,11 +15,6 @@
 #include <loongson.h>
 #include <boot_param.h>
 
-static inline void loongson_reboot(void)
-{
-	((void (*)(void))ioremap(LOONGSON_BOOT_BASE, 4)) ();
-}
-
 static void loongson_restart(char *command)
 {