SRSSupport in Service List offering

[juhajoki]

See Chapter 5.6.4.1:
"If the Service List Server supports Server-side Region Selection it shall support the postcode method (see clause
5.6.4.2) or the regionID method (see clause 5.6.4.4) or both. Additionally, it may support the method based on
receivable multiplex (see clause 5.6.4.3). If the Service List Server supports Server-side Region Selection it shall
indicate the methods available by including the SRSSupport element in the ServiceListOffering."