Update db.txt regulatory database.

Obtained from:

git://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git

This nets us 6 dBm improvement in channels 36-48.

See  b/33594904

Change-Id: Ie8ee14f68424e7924a55ad708f9e8078e382fda5
1 file changed