icc: dt-bindings: add endpoint IDs for interconnects for YUPIK

Add endpoint ID for GIC master which consumers can use to set bandwidth
constraints and find paths in the NoC (Network-On-Chip) topology.

Change-Id: I673888840c4dc2770ccb6d5dab76bab72c3af3cf
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>