increase headset mic gain

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

Bug: 11660005.
Change-Id: I47bc4266a0ff4d781cbaeca59b39fd4291d6243d
BoardConfig: Define TARGET_TOUCHBOOST_FREQUENCY to 1.2GHz

Bug: 11387181
Change-Id: Icf3272edbb1052861a13aa17f3b14ee40ea57654
Signed-off-by: Iliyan Malchev <malchev@google.com>