msc: Separate as_GSUP_SAI from f_mm_auth

In some cases we might want to match on (and perform) the GSUP
SEND AUTH INFO without also expecting/performing a MM authentication
on the Iu/A interface.  Hence it makes sense to split those two.

Change-Id: I7b298d589930bab976b478ac84553a6352f25c93
1 file changed