fixed hard-code default DRB-ID (1) so it is now fully configurable

(cherry picked from commit 4499124853b8985c3f157721997125370f1ca475)

Conflicts:
	openair2/LAYER2/PDCP_v10.1.0/pdcp_fifo.c

Conflicts:
	openair2/LAYER2/PDCP_v10.1.0/pdcp.c