[MIPS] remove wrppmc_machine_power_off()

It can be replace wrppmc_machine_halt().

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/gt64120/wrppmc/setup.c b/arch/mips/gt64120/wrppmc/setup.c
index 728ef6a..ca65c84 100644
--- a/arch/mips/gt64120/wrppmc/setup.c
+++ b/arch/mips/gt64120/wrppmc/setup.c
@@ -98,11 +98,10 @@
 {
 	extern void wrppmc_machine_restart(char *command);
 	extern void wrppmc_machine_halt(void);
-	extern void wrppmc_machine_power_off(void);
 
 	_machine_restart = wrppmc_machine_restart;
 	_machine_halt	 = wrppmc_machine_halt;
-	pm_power_off	 = wrppmc_machine_power_off;
+	pm_power_off	 = wrppmc_machine_halt;
 
 	/* This makes the operations of 'in/out[bwl]' to the
 	 * physical address ( < KSEG0) can work via KSEG1