[XFRM] Convert XFRM_MSG_* macros to an enum

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

I'd like to add two new xfrm_user messages, FLUSHSA and FLUSHPOLICY.

I've cleaned up the existing MSG definitions by converting them to
an enum.  This should make future additions slightly easier in that
XFRM_MSG_MAX won't have to be touched again.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

Cheers,
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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