library/GSM_Types: rework f_enc_BcdMccMnc: split and rename

* Rename f_enc_BcdMccMnc() -> f_enc_BcdMccMnc_int()
* Add f_enc_BcdMccMnc() accepting a pair of GsmMcc/GsmMnc

Change-Id: I033cce8f975f61ef2216de9f34f2ca418d71dc0b
Related: SYS#5602
2 files changed