BTS codec pref legacy compat: allow all codecs per default

Legacy compat: we used to not check the BTS codec-pref settings upon assignment
until we added checks for the BTS codec-pref in osmo-bsc
5bc43cd107597b78f701f77c7fd4cce8f923dce5, change-id
I285234e9c81de74d9fb9907fca2c443b08537435, "codec_pref: check bts codec
support". From that commit onwards, config setups without a 'codec-pref'
potentially stop working (like all osmo-gsm-tester runs just did), because with
no codec-pref settings, now only FR is permitted, while before the patch, we
would allow any codecs as long as MSC and the overall BSC config agree on them.
So, upon BTS initialization, enable all codecs. These get reset to a more fine
grained selection IF a 'codec-support' config appears in the config file (see
bsc_vty.c).

Change-Id: I4650a1f8e350c6f74f48391f43ddfe771be01e1b
1 file changed