wl12xx: add missing FM firmware

From here: https://github.com/richi-chen/device_ti_richi-panda_jb/tree/master/proprietary-open/bt/omap4/system/etc/firmware

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: Ia65441894014903b27fcb73de93619a321859f70