GSM_RR_Types: Add support for VBS/VGCS related L3 RR messages

This adds support for the VBS/VGCS related L3 RR messages to
GsmRrL3Union/GsmRrL3Message.  Only those with proper L3 header
and classic "tabular" syntax are supported so far, no CSN.1 messages
with short L2 header for SACCH.

Change-Id: I79ca7ee2b94bb370cd7162cfd9db436049998041
1 file changed