Add Spanish United States keyboard

The subtype locale name on the spacebar will be suppressed when only
one subtype is enabled and
 - Subtype locale is equal to the system locale.
or
 - Subtype language is equal to the system language but the subtype is
   implicitly enabled.

Thus the "es_ES" system locale chooses "es" subtype keyboard
implicitly but the keyboard doesn't have the subtype name on its
spacebar.

This change also removes Spanish Latin America keyboard.

Bug: 7531804
Change-Id: Ib929e8235d643c0ba039eb010e18ab721a734e15