arch: hexagon: kernel: reset.c: use function pointer instead of function for pm_power_off and export it

'pm_power_off' is a function pointer, not a function, so need change
its type, and also need export it, or can not pass compiling with
allmodconfig. The related error:

MODPOST 2879 modules
ERROR: "pm_power_off" [drivers/char/ipmi/ipmi_poweroff.ko] undefined!

Signed-off-by: Chen Gang <[e-mail]>
Signed-off-by: Richard Kuo <[e-mail]>

arch/hexagon/kernel/reset.c

···
 {
 }
 
-void pm_power_off(void)
-{
-}
+void (*pm_power_off)(void) = NULL;
+EXPORT_SYMBOL(pm_power_off);