Merge branch 'xfrm/compat: Fix xfrm_spdattr_type_t copying'

Dmitry Safonov says:

====================
Here is the fix for both 32=>64 and 64=>32 bit translators and a
selftest that reproduced the issue.

Big thanks to YueHaibing for fuzzing and reporting the issue,
I really appreciate it!
====================

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>