Revert "Avoid IME restart for configChanges"

Revert "Add cts for InputMethodService configChanges"

Revert submission 13727407-167948419

Reason for revert:
Possible root cause of Bug 182604598.

Reverted Changes:
Ib94fddadb:Avoid IME restart for configChanges
Ieca327b2e:Add cts for InputMethodService configChanges

Bug: 167948419
Bug: 182604598
Test: presubmit
Change-Id: I3accc55ac65d0e2ec30c3f6023680fda27ad3e97