Simplify getImplicitlyApplicableSubtypesLocked

This is a mechanical refactoring CL. There must be no behavior change.

Bug: 309837937
Test: atest FrameworksServicesTests:InputMethodUtilsTest
Change-Id: Iaebf7c4c1612cfd7113c01834fae266f31d4f0b6
3 files changed