Call loadKeyboard later if it can't be called right away

Since loadKeyboard relies on the input connection being
available to give it the auto-caps state, but also can't
be called twice in a row because it needs to save and
restore its state and invalidates it after the restore,
we need to wait until we know we have a valid input
connection to call it.

Bug: 11107229
Change-Id: I1c7baf3215682df6f6ceb357bd37254f9e7418c7