[ALSA] hda-codec - Fix SKU ID function for realtek codecs

Fixed SKU ID function for realtek codecs.  It's used by the automatic
BIOS configuration mode.  Now it supports the correct jack-detection
mechanism, too.

Signed-off-by: Kailang Yang <kailang@realtek.com.tw>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>