[ALSA] hda-codec - Update realtek codec support

1. Support HP rp5700
2. Fixed alc_subsystem_id function (Bug fixed and support Desktop)
3. Support ASUS EP20

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>