Revert "manta: Set default locale to US"

Manually merge ag/451386 from klp-dev to master.

Resolving merge conflict caused by previous enabling DFS channels on master.
After this change, the locale will have both DFS channels and channel 12/13.

Bug: 13894807
Change-Id: Iea1deb8858333b34a93e44a51bc53013cbee53b4
1 file changed