Remove overload ImeVisibilityApplier#applyImeVisibility

Removed the overloaded method to prevent callers to mismatch the
integer parameters. Callers must now specify the reason when
applying IME visibility.

Fix: 350101939
Test: presubmit
Test: atest DefaultImeVisibilityApplierTest
Flag: EXEMPT refactor
Change-Id: Ibbcaedd3263d7d5f01b0a55089ec0edd5bc00570