Fix DominatorTree for locale and mcc/mnc config

De-duping of configurations with locales was disabled previously since
there is not a good way to dedupe locales in a forwards compatible way
(change SHA: e3856748).

In b/171892595, since every locale is a root in the dominator tree,
configs that do not specify locale qualifiers are dominated by the
default config and their values are checked for compatiblity with the
locale config values.

b/171892595 took a while to detect because, this is only an issue at
runtime when a resource has one config containing mnc/mcc without a
locale, one config containing a locale, and the values for the configs
differ. This is because mcc/mnc is the only qualifier with a greater
precedence than locale.

Make configurations with mcc/mnc and mcc unable to be dominated until
locale deduping is fixed.

Bug: 171892595
Bug: 62409213
Test: aapt2-tests
Change-Id: Ia0a5e5d7a1650d070f5f2fcaf9a8469a8c7dabe6