osmo_bsc_main.c: simplify computation of CCCH_CONFIG

Do not count the number of additional CCCHs if TS0 is using combined
channel configuration (CCCH+SDCCH4), because they are only allowed
if TS0 is not combined with SDCCH.

Get rid of the 'switch' statement using the following formula:

  CCCH_CONFIG = (N << 1)

where N is the number of additional CCCHs.

Change-Id: I1430500999389e9b30e55ea89a8a5ea5071f7957
1 file changed