Removing deprecated overlay variables.

Many varibles were migrated from res/values/config.xml into
CarrierConfigManager.java. The override values based on MCC-MNC have
been migrated into packages/apps/CarrierConfig.
They should now be removed from these XML files.

For now, nothing is removed from the base config.xml until we can be
sure we have fixed every overlay, including the ones in the device/ and
vendor/ folders.

Bug: 20827908
Change-Id: I7df8a1a43a98eb012937131e6c650e75bcea91c1
18 files changed