Floss: Do not always print scan result

Floss emits OnScanResult even with the scan is initiated by discovery
instead of LE scan API. This is fine for application but for btclient it
is spammy for user. So we should only print at OnScanResult only if
btclient requests for LE scan.

Bug: 233124021
Tag: #floss
Test: Manual - btclient on Linux

Change-Id: Ib7b9bf9f4a69771bf81cc0b39011262e4d2e4f19