Fix debug output
Fix debug output

Previously frame number was not saved in case of PRIM_TCH rendering many
debug statements with g_time useless.

Change-Id: Ib8d8c919862d0de8e2ebf7753c2592e0d91b09c5
Reviewed-on: https://gerrit.osmocom.org/195
Tested-by: Jenkins Builder
Reviewed-by: Harald Welte <57a0f16bf14496e20d21dd8c0873142ff0a2fbb4@gnumonks.org>

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts