selinux/nlmsg: add XFRM_MSG_REPORT

[ Upstream commit b0b59b0056acd6f157a04cc895f7e24692fb08aa ]

This command is missing.

Fixes: 97a64b45 ("[XFRM]: Introduce XFRM_MSG_REPORT.")
Reported-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>