UPSTREAM: xfrm: fix XFRMA_OUTPUT_MARK policy entry

This seems to be an obvious typo, NLA_U32 is type of the attribute, not its
(minimal) length.

Fixes: 077fbac4 ("net: xfrm: support setting an output mark.")
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

(cherry picked from commit e719135881f00c01ca400abb8a5dadaf297a24f9)
Signed-off-by: Benedict Wong <benedictwong@google.com>
Bug: 113046120
Change-Id: I4c1a8de03febfa246b99c7eb67d77f74a1e3ba93