xfrm: export verify_userspi_info for pkfey and netlink interface

In order to check against valid IPcomp spi range, export verify_userspi_info
for both pfkey and netlink interface.

Signed-off-by: Fan Du <fan.du@windriver.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

diff --cc include/net/xfrm.h
Simple merge

diff --cc net/key/af_key.c
Simple merge

diff --cc net/xfrm/xfrm_state.c
Simple merge

diff --cc net/xfrm/xfrm_user.c
Simple merge