Enable preliminary subtypes for F-release

java/res/xml/method.xml

...ard/layout/tests/KeyboardLayoutSetSubtypesCountTests.java

...oid/inputmethod/keyboard/layout/tests/TestsBengaliBD.java

...roid/inputmethod/keyboard/layout/tests/TestsHinglish.java

...oid/inputmethod/keyboard/layout/tests/TestsMyanmarMM.java

.../inputmethod/keyboard/layout/tests/TestsSerbianLatin.java

...method/keyboard/layout/tests/TestsSerbianLatinQwerty.java

...droid/inputmethod/keyboard/layout/tests/TestsTamilLK.java

...android/inputmethod/keyboard/layout/tests/TestsUzbek.java

...d/inputmethod/keyboard/layout/tests/TestsUzbekQwerty.java