staging: android: binder: move to the "real" part of the kernel

The Android binder code has been "stable" for many years now.  No matter
what comes in the future, we are going to have to support this API, so
might as well move it to the "real" part of the kernel as there's no
real work that needs to be done to the existing code.

Change-Id: I36d5c6fc05aff26dd01a227201be18e86c9f9994
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>