Revert "xfrm: fix dflt policy check when there is no policy configured"

This reverts commit 57c1bbe7 which is
ec3bb890 commit upstream.

It breaks the Android kernel ABI and if this really needs to be added to
Android, it must come back in a format in the future that does not break
the abi.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iebfe2659463646982cc41c7cd29db2d51ef5e6eb