TWSP-HF: adjust updating twsp device from p_scb (1)

3 scb are allocated While register HFP AG service, so
bta_ag_scb_to_idx will return index in range {0,1,2}.
While incoming tws+ connection found on handle 0x0003,
the corresponding index get from pscb will be 2, this
eb index is taken as invalid index in updating twsp
device.

Adjust updating twsp device method to handle all possible
pscb and eb index.

Change-Id: Ibd50913e13683b8fc641a134fcaa9a6111080cdd
CRs-Fixed: 2390270
2 files changed