[ALSA] Add iBook 1.33GHz support

PPC PMAC driver
Added the support of iBook 1.33GHz.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/ppc/pmac.c b/sound/ppc/pmac.c
index e35b48d..392b2ab 100644
--- a/sound/ppc/pmac.c
+++ b/sound/ppc/pmac.c
@@ -988,6 +988,7 @@
 		case 0x33:
 		case 0x29:
 		case 0x24:
+		case 0x50:
 		case 0x5c:
 			chip->num_freqs = ARRAY_SIZE(tumbler_freqs);
 			chip->model = PMAC_SNAPPER;