edge: Add is_received and invalidate_bsn to gprs_rlc_ul_window

These methods will be needed for EGPRS decoding.

The is_received method returns true iff a block with the given BSN
has already been received in the current window. A call to
invalidate_bsn marks the block as not received.

Sponsored-by: On-Waves ehf
2 files changed