Revert "xfrm: rework default policy structure"

This reverts commit 0d2e9d80 which is
b58b1f56 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: I0a8403a202b21cda7f856ea143c5b01b78346078