Remove CSFB references from RR Chan Release CellSelectionIndicator IE

The IE contains a cell list for the MS to register after the channel
is released. The IE is used in CSFB, but not only in that case: it's
also used in SRVCC.
Hence let's remove the CSFB references since the scope is more wide.

Related: SYS#5337
Change-Id: Ia1eeda98fc21aa92bb2e41b5e4761c5cf6516a7e
2 files changed