bebob: fix wrong parsing of clock source information for Terratec Phase 88

Terratec Phase 88 rack fw has two registers for source of clock, one is
for internal/external, and another is for wordclock/spdif for external.

The combination of these registers can be "internal" and "wordclock".
In this case, current code parses them as over-index of labels.
firewire-lib: Add sorting in-packets for full duplex streams with sync

In full duplex streams with synchronization, consistency of SYT field in
in-packets is important for out-packets. This commit add sorting in-packets
according to the value of dbc.