dyn TS, dyn PDCH: common/l1sap.c: properly notice PDCH
dyn TS, dyn PDCH: common/l1sap.c: properly notice PDCH

In l1sap_ph_rts_ind(), l1sap_ph_data_ind() and to_gsmtap(), the decision
to handle a TS as PDCH was still missing for dynamic TS.

It is not yet clear why this did not impact functionality for dynamic timeslots
on other BTS models. AFAICT they should not work without this patch, but in
fact they do. It would be nice to clarify this some day.

Change-Id: I7b873a089a3de70d980885a7539cb91997464743

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