wifi: Allow configuration of country code for wifi (3/3)

Wifi country code handling is a nightmare - Most retail devices
have region customization in /system for each country a device
is shipped to.

This doesn't work very well for a firmware like Cyanogenmod,
where we try to support all target countries with one firmware
package.  For whatever reason, with newer Broadcom drivers/
firmware blobs, the old trick of using a universal region code
(ccode=ALL in nvram_net.txt) does not seem to work.  Who knows
what the deal is for other wifi chipsets.

The good thing is that wpa_supplicant has a standardized
cross-chipset method for setting the region code, and we
use that here.

Cherry-Pick: http://review.cyanogenmod.org/#/c/54904/
Require: I429326a77649c77ba40b00eb2236de3ca8839e57
         Id9f00d3a678642c6c142fd1511af820d729507a7

JIRA: CML-118

Change-Id: Ia9f5133f61f56d89ccb290e37a393f5de507e1cf