xfrm: interface: rename xfrm_interface.c to xfrm_interface_core.c

stable inclusion
from stable-v5.10.186
commit 01af67ed83d0019e3d1c2d4bb8c1f878fe34e1d9
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8L5XP

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=01af67ed83d0019e3d1c2d4bb8c1f878fe34e1d9



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[ Upstream commit ee9a113a ]

This change allows adding additional files to the xfrm_interface module.

Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Link: https://lore.kernel.org/r/20221203084659.1837829-2-eyal.birger@gmail.com


Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Stable-dep-of: a287f5b0 ("xfrm: Ensure policies always checked on XFRM-I input path")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>