powerpc/ps3: Fix sys-manager-core sparse warnings

Fixes warnings like these:

  drivers/ps3/sys-manager-core.c: error: symbol 'ps3_sys_manager_power_off' redeclared with different type
Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/ps3/sys-manager-core.c

@@ -47,7 +47,7 @@ void ps3_sys_manager_register_ops(const struct ps3_sys_manager_ops *ops)
 }
 EXPORT_SYMBOL_GPL(ps3_sys_manager_register_ops);
 
-void ps3_sys_manager_power_off(void)
+void __noreturn ps3_sys_manager_power_off(void)
 {
 	if (ps3_sys_manager_ops.power_off)
 		ps3_sys_manager_ops.power_off(ps3_sys_manager_ops.dev);
@@ -55,7 +55,7 @@ void ps3_sys_manager_power_off(void)
 	ps3_sys_manager_halt();
 }
 
-void ps3_sys_manager_restart(void)
+void __noreturn ps3_sys_manager_restart(void)
 {
 	if (ps3_sys_manager_ops.restart)
 		ps3_sys_manager_ops.restart(ps3_sys_manager_ops.dev);
@@ -63,7 +63,7 @@ void ps3_sys_manager_restart(void)
 	ps3_sys_manager_halt();
 }
 
-void ps3_sys_manager_halt(void)
+void __noreturn ps3_sys_manager_halt(void)
 {
 	pr_emerg("System Halted, OK to turn off power\n");
 	local_irq_disable();