Bluetooth: controller: Fix to restrict addr set in active scan

Fix controller implementation to only restrict HCI LE Set
Random Address command when advertising and/or active
scanning is enable.

Continues to pass the following LL.TS.5.0.2 conformance
test:
LL/SEC/SCN/BV-01-C [Random Address Scanning]

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>