When set_fcc_channel is set, host driver sets tx_power info about
channels 12, 13 to hardcoded values. Now firmware sends information
about channels 12, 13 to host driver and currently there is no
support to extract and store this information and use it to
modify tx_power of channels 12, 13 in host driver.
Add support to store the tx_power of channels 12, 13 received
from firmware and use this to modify tx_power of fcc channels.
Change-Id: Ie7b20a75bb09956a70b7b133ce7ce9beb8db138b
CRs-Fixed: 3270676
c70f8eec91