Changes

RSSI app: Use correct BSIC for RACH bursts

A regular RACH burst uses the BSIC of the cell. A 'UIC' (uplink identity
code) value is used for ASCI group calls. The value 0xff disables 'UIC'.

Fixes: 23d46f003 ("ASCI: Add UIC support to random access burst")

Change-Id: I63ed20160d9d45cbc3f70cec8b1c0af262fdde19