hammerhead: Better mount options to improve performance

Change-Id: I18f7165c2ff8547b7968d946336d948fe30522b1
increase headset mic gain

Increase headset mic gain by 18dB for
all use cases.

Bug: 11660005.
Change-Id: I47bc4266a0ff4d781cbaeca59b39fd4291d6243d

Conflicts:
	mixer_paths.xml