ExpandHelper: Improve one finger expanding forced handling

Instead of force returning false if view is null, setup a boolean
to force it with custom views like hover. Cherry-picked from CM.

Also request disallow intercept on drag started.

Change-Id: Ie0043744fa7df6a15814c663add807e75399c2d7
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>