[ALSA] Fix __devinit and __devexit issues with sound drivers

Fix __devinit and __devexit issues with sound drivers.
Resolves MODPOST warnings similar to:
WARNING: sound/drivers/snd-dummy.o - Section mismatch: reference to .init.text:snd_dummy_probe from .data.rel.local between 'snd_dummy_driver' (at offset 0x0) and 'snd_dummy_controls'
WARNING: sound/drivers/snd-mtpav.o - Section mismatch: reference to .init.text:snd_mtpav_probe from .data.rel.local between 'snd_mtpav_driver' (at offset 0x0) and 'snd_mtpav_input'
WARNING: sound/drivers/snd-virmidi.o - Section mismatch: reference to .init.text:snd_virmidi_probe from .data.rel.local after 'snd_virmidi_driver' (at offset 0x0)

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/drivers/portman2x4.c

@@ -811,7 +811,7 @@ __err:
 	return err;
 }
 
-static int snd_portman_remove(struct platform_device *pdev)
+static int __devexit snd_portman_remove(struct platform_device *pdev)
 {
 	struct snd_card *card = platform_get_drvdata(pdev);
 
@@ -824,7 +824,7 @@ static int snd_portman_remove(struct platform_device *pdev)
 
 static struct platform_driver snd_portman_driver = {
 	.probe  = snd_portman_probe,
-	.remove = snd_portman_remove,
+	.remove = __dev_exit_p(snd_portman_remove),
 	.driver = {
 		.name = PLATFORM_DRIVER
 	}
@@ -833,7 +833,7 @@ static struct platform_driver snd_portman_driver = {
 /*********************************************************************
  * module init stuff
  *********************************************************************/
-static void snd_portman_unregister_all(void)
+static void __init_or_module snd_portman_unregister_all(void)
 {
 	int i;