commit 70478da87767198d8a9b9314f890fba1d5997e4d
author Vinit Deshpande <vinitd@google.com> Thu Oct 01 10:48:34 2015 -0700
committer Vinit Deshpande <vinitd@google.com> Fri Oct 02 11:46:50 2015 -0700
tree 2f8d786420fef1d5a1bb18eaae15e0e3ef4b063f
parent 57b578f21d16d3b0da0162cb6eb9fa8b29895d8f

Persist and use country code reliably

It looks like we never persisted country code if it wasn't
set on the driver; this is not correct.

Also fixed initial sequence - the cached country code is now
trashed on reboot if config_wifi_revert_country_code_on_cellular_loss
is set. New country codes will be set if telephony stacks
retrieve them; or else, ro.boot.wificountrycode will stick.

Note that there are possible race conditions between telephony
finding country codes and starting Wifi functionality (like SoftAP)
so it is possible that Wifi uses more conservative country code
from ro.boot.wificountrycode even if telephony finds a better
country code later. The situation will recover eventually.

Bug: 24553903

Change-Id: I37bb2f64947ab04a82a0392eb85f521a08147e29