ALSA: hda - Enable beep for IDT92HD87 / 88 codecs

These codecs have the digital beep widget in NID 0x21.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_sigmatel.c

@@ -5471,7 +5471,6 @@ again:
 		spec->num_pins = ARRAY_SIZE(stac92hd88xxx_pin_nids);
 		spec->pin_nids = stac92hd88xxx_pin_nids;
 		spec->mono_nid = 0;
-		spec->digbeep_nid = 0;
 		spec->num_pwrs = 0;
 		break;
 	case 0x111d7604: