Revert "Revert "net: wireless: update db.txt for WLAN""

This reverts commit f5bdf8e4aff61b436f3f3a98e3797343847b6bc3.

The commit was previously reverted in order to allow
a clean revert for restoring the internal regulatory
db feature from
commit c8c240e2 ("cfg80211: reg: remove support for built-in regdb"),
since this commit included a default version of db.txt.

Change-Id: Ibadad5ccdb006fda79b4d494a1995fb77995b953
Signed-off-by: Lior David <liord@codeaurora.org>