Revert "xfrm: notify default policy on update"

This reverts commit 9856c3a1 which is
88d0adb5 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: I4e7bf3d512309e061272648fdb5733e270ab4279