Route touches via NPVController instead of LockIcon's onClickListener

Or else when the lock icon disappears (unlock) and user continues
holding the lock icon area, touches will be sent to NPV and falsely
expand the shade.

Test: manual + with TalkBack
Fixes: 192404880
Change-Id: Iea97062f5b813bee6a06112f25d8e4008a25ac12