MIPS: Cobalt: Fix missing prototypes

Fix missing prototypes warnings for cobalt_machine_halt() and
cobalt_machine_restart() by moving their prototypes to cobalt.h which is
included by setup.c.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/cobalt/setup.c

@@ -23,9 +23,6 @@
 
 #include <cobalt.h>
 
-extern void cobalt_machine_restart(char *command);
-extern void cobalt_machine_halt(void);
-
 const char *get_system_type(void)
 {
 	switch (cobalt_board_id) {

arch/mips/include/asm/mach-cobalt/cobalt.h

@@ -19,4 +19,7 @@ extern int cobalt_board_id;
 #define COBALT_BRD_ID_QUBE2    0x5
 #define COBALT_BRD_ID_RAQ2     0x6
 
+void cobalt_machine_halt(void);
+void cobalt_machine_restart(char *command);
+
 #endif /* __ASM_COBALT_H */