[ALSA] hda-codec - Fix ALC262 HP-RP5700 model

Removed the PCM mixer elements conflicting with others.
Also renamed Master control to Headphone, which isn't a real master.
(The Master control is still created as a virtual master even after
 this rename.)

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>