Restore AOSP repeat and longpress timeouts

partial revert of 847687174df36451826e6054937b73e958666f92 because:
1. this is what overlays are for.
2. increasing the key repeat start timeout by 50% is drastic.
3. because I periodically have to move my cursor in a textbox to restore my ability to use backspace, and this SMELLS FUNNY.

Change-Id: If35b7d20e3c5676e141bc3c0c1d2156fbacde7b1