Unextract getExplicitlyOrImplicitlyEnabledInputMethodsAndSubtypeListLocked()

By un-extracting it, we no longer need to instantiate HashMap just to
pass data from InputMethodSettings to InputMethodAndSubtypeList.

This also helps us elimicate the use of HashMap/HashSet in
com.android.server.inputmethod (Bug 119839847).

This is a mechanical refactoring.  There should be no user-visible
behavior change.

Fix: 119837138
Test: Manually verified as follows:
  1. Open Settings.
  2. Go to System -> Languages & input -> Languages
  3. Tap "Add a language"
  4. Select "Afrikaans" -> Suid-Afrika
  5. make -j SoftKeyboard
  6. adb install -r $OUT/system/app/SoftKeyboard/SoftKeyboard.apk
  7. adb shell ime enable com.example.android.softkeyboard/.SoftKeyboard
  8. Tap the keyboard icon on the navigation bar.
  9. Make sure that items are sorted in the following order:
     * English (US) - Android Keyboard (AOSP)
     * Afrikaans - Android Keyboard (AOSP)
     * English (United States) - Sample Soft Keyboard
Change-Id: I0444b9bd82f63bbca1841144f5c02b0b34acc807