Use new asn1c and add ASN.1 for LTE-RRC, S1AP and X2AP
Use an un-official community collaboration version of asn1c
- It's no need to modify LTE-RRC's ASN.1 file for enabling option group feature in generate_asn1.
- It's no need to patch the C header files generated from LTE-RRC/S1AP/X2AP's ASN.1 in fix_asn1.
- It's no need to pre-process S1AP/X2AP's ASN.1 for enabling information object class feature by asn1tostruct.py.