ALSA: hda-intel: improve initialization for ALC262_HP_BPC model

Fix issues for 3 generations of HP workstations.

The modest modifications do the following:
1. Change the second MIC from device 3 to device 1
2. Init the "boost" values to "0" by default

From: John Brown <john.brown3@hp.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>