RSL: Allow disabling of BCCH/SACCH filling for given SI type

If we want to instruct the BTS to stop sending a given SI, we must be
able to send the respective BCCH INFO / SACCH FILLING with a header but
without any L3 data IE.  This patch enables the related functions to do
this whenever their data argument points to NULL.

Change-Id: I88b85614951a108574f05db3b706884afe7e87a9
1 file changed