ALSA: hda - fix audio on LG R510

Currently, LG R510 is only able to produce sound on headphones, the
internal speakers are not working.

The user tested and confirmed that with model=Dell headphones,
internal speakers and the microphone are working flawlessly.

Tested-by: Serdar Soytetir <tulliana@gmail.com>
Signed-off-by: Ozan Çağlayan <ozan@pardus.org.tr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>