edge: Add Encoding::rlc_data_to_dl_append

This function appends a single chunk to an RLC downlink data block.
The implementation is basically taken from the
gprs_rlcmac_dl_tbf::create_new_bsn method without the TBF related
functionality and any side effects.

Note that it still only supports GRPS.

Sponsored-by: On-Waves ehf
4 files changed