Add assumption check to skip inline autofill tests on automotive

* automotive doesn't have the FEATURE_INPUT_METHODS, so MockIme
  is not available there. For this reason, inline autofill
  tests will fail because the inline suggestions won't show up
  in the default IME from the automotive
* Adding assumption check for availability of FEATURE_INPUT_METHOD
  will skip these tests on aotomotive

Test: atest android.autofillservice.cts.inline
      on gcar_hl_emu_x86-userdebug emulator
Bug: 159631291

Change-Id: Idb0d1401bd643aa45ca657fd670f4b4f80b0ef56
9 files changed