Staging: add android framework

This prepares us to start adding the android drivers
to the build.

The dummy android.c file will go away in the next few patches, as it
will not be needed once drivers/staging/android/ has a driver in it.

Cc: Robert Love <rlove@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>