library: Define 'solSACapability' as '0'

"according to a comment in f_gmm_attach() there's an encoder problem if it's omit.  This sounds like the ts_GMM_ATTACH_REQ()
should be changed to define solSACapability as '0' insteads of omit.  At that point none of the users of ts_GMM_ATTACH_REQ
will need to manually modify it anymore."
(quote: hwelte on Gerrit (https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/31199/comments/17ed155d_cc58810a))

Related: OS#4221
Change-Id: I9eaa39274456e5cc0a1cf025bf956970efc4a51f
1 file changed