Reset the setOnKeyListener callback when view is destroyed

NPE happened in mListOnKeyListener.onKey().

It looks like onKey in some cases is sent to a view while beeing
destroyed. When callback is received mList is referenced causing
the NPE.

Remove OnKeyListener first when destroying view so we can not get
any unwanted key callbacks.

Bug: 22333421

Change-Id: I94b198e31a2f9fbdd7fbadf4971be7720dcfad8d