tests: bsim: Bluetooth: central_hr_peripheral_hr for nrf54l15bsim

Enable central HR peripheral HR samples for nrf54l15bsim.
RealEncryption is BabbleSIM is not enabled as nRF54L port
in Zephyr Controller is not yet supported and the test is
also not using security (SMP pairing).

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