Iu: Send SMS over SAPI-3

After neels/ho was merged, SMS over IuCS/RANAP was failing in both
MO and MT direction.  The reason was that all mobile-terminated SMS-CP
layer messages were sent in RANAP with SAPI-0 instaed of SAPI-1.

Change-Id: I98e6eddb52d5c61c4e2d34bdfcd43cf460296ad7
Closes: OS#3993
1 file changed