Shorten attr "name" length of mock ime service

Test: atest android.view.inputmethod.cts.InputMethodRegistrationTest
Fix: 308057841
Change-Id: I068a9b40665b328d6181faf64a79dbae5175dbad
Merged-In: I068a9b40665b328d6181faf64a79dbae5175dbad
1 file changed