gsm_data: set meaningful default values for amr modes

The function gsm_bts_alloc() does set default values for the amr rates
for a newly allocated bts, but it does not populate the ms_mode and
bts_mode flags which contain hysteresis and threshold. Those values are
currently set to 0 by default, which does not make much sense. Lets
popluate some appropriate default values.

- Make sure that .mode .hysteresis and .threshold are populated for
  MS and BTS in full and halfrate

Change-Id: If14843feeeea6584e5991d5c0abb765611dfaa57
Related: OS#3529
1 file changed