Move PhoneWindow and friends back into internal package

PhoneWindow, PhoneLayoutInflater and PhoneFallbackEventHandler decided
to @hide out over in the android.view package after the policy jar was
disbanded. Give them a more appropriate home over in framework that
doesn't imply that they should be accessed from other internal layers
of abstraction.

Bug 19606548

Change-Id: Id07b791d178fa447010b49b24726b52208838e88