Revert "genetlink: remove genl_bind"

This reverts commit 7b42410d which is
commit 1e82a62fec613844da9e558f3493540a5b7a7b67 upstream.

It breaks the API and isn't something we should really have to worry
about in android devices.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I4ec83063705a9f0fe449ff46803f6594b69efd08