tests: bsim: bluetooth: host: privacy: peripheral: add RPA check

Modified the BabbleSim test for the Bluetooth test under the
host/privacy/peripheral category. Added the RPA check in the scan
callback context of the scanning tester device to validate if the
DUT advertising address is correct.

Signed-off-by: Kamil Piszczek <Kamil.Piszczek@nordicsemi.no>