[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>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 22aee1a..959c80d 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -811,6 +811,7 @@
 	  hp-bpc	HP xw4400/6400/8400/9400 laptops
 	  hp-bpc-d7000	HP BPC D7000
 	  hp-tc-t5735	HP Thin Client T5735
+	  hp-rp5700	HP RP5700
 	  benq		Benq ED8
 	  benq-t31	Benq T31
 	  hippo		Hippo (ATI) with jack detection, Sony UX-90s
@@ -835,7 +836,8 @@
 	  3stack-6ch-dig 3-stack (6-channel) with SPDIF
 	  6stack-dig	 6-stack with SPDIF
 	  lenovo-101e	 Lenovo laptop
-	  eeepc-p701	ASUS Eeepc
+	  eeepc-p701	ASUS Eeepc P701
+	  eeepc-ep20	ASUS Eeepc EP20
 	  auto		auto-config reading BIOS (default)
 
 	ALC882/885