[ALSA] portman2x4 section mismatch

FIx section mismatch when CONFIG_HOTPLUG=n:
WARNING: sound/built-in.o(.exit.text+0x271): Section mismatch: reference to .init.text:snd_p
ortman_unregister_all (between 'snd_portman_module_exit' and 'alsa_mpu401_uart_exit')
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/drivers/portman2x4.c

@@ -833,7 +833,7 @@ static struct platform_driver snd_portman_driver = {
 /*********************************************************************
  * module init stuff
  *********************************************************************/
-static void __init_or_module snd_portman_unregister_all(void)
+static void snd_portman_unregister_all(void)
 {
 	int i;