Can't setup ISO Broadcast Demo on nrf53dk

[kaiser-ren]

Describe the bug
I compiled and flashed ./samples/bluetooth/iso_broadcast/ on nrf53dk. After power-on the dk, I found that there was an error when host sent HCI_LE_Set_-Extended_-Advertising_Parameters to controller, the controller return an event with status 0x01.

To Reproduce
Steps to reproduce the behavior:

1. cd ./samples/bluetooth/iso_broadcaster/
2. west build -p auto -b nrf5340dk_nrf5340_cpuapp ./
3. west flash
4. west build -p auto -b nrf5340dk_nrf5340_cpunet ./
5. west flash

Expected behavior
A clear and concise description of what you expected to happen.

Impact
Can't setup BIG/BIS

Logs and console output
```*** Booting Zephyr OS build zephyr-v2.5.0-3928-g86f18a61fa05 ***
Starting ISO Broadcast Demo
Failed to create advertising set (err -5)
[00:00:00.010,437] bt_hci_core: HW Platform: Nordic Semiconductor (0x0002)
[00:00:00.010,437] bt_hci_core: HW Variant: nRF53x (0x0003)
[00:00:00.010,437] bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 2.6 Build 0
[00:00:00.011,169] bt_hci_core: Identity: D5:2B:02:90:B0:4F (random)
[00:00:00.011,169] bt_hci_core: HCI: version 5.2 (0x0b) revision 0x0000, manufacturer 0x05f1
[00:00:00.011,169] bt_hci_core: LMP: version 5.2 (0x0b) subver 0xffff
[00:00:00.011,413] bt_hci_core: opcode 0x2036 status 0x01
``\

Environment (please complete the following information):

• Commit SHA or Version used: cd9421a

Additional context
Add any other context about the problem here.