BT Identity address is overwritten when using extended advertising

[Thalley]

Describe the bug
If attempting to advertise by a random static address by creating an ID and using that ID for extended advertising, the random static address of the ID is overwritten with an NRPA when advertising is started. This when BT host privacy is disabled (CONFIG_BT_PRIVACY=n).

To Reproduce
Steps to reproduce the behavior in the bt shell:

1. bt id-create ed:a1:a2:a3:a4:ab
2. bt id-select 1
3. bt adv-create conn-scan identity name
4. bt adv-start

Expected behavior
That advertising is using ed:a1:a2:a3:a4:ab as the address.

Impact
What impact does this issue have on your progress (e.g., annoyance, showstopper)

Logs and console output

< HCI Command: LE Set Advertising Set Random Address (0x08|0x0035) plen 7         #2408 3522.372113
        Advertising handle: 0x00
        Advertising random address: ED:A1:A2:A3:A4:AB (OUI ED-A1-A2)
> HCI Event: Command Complete (0x0e) plen 4                                       #2409 3522.373426
      LE Set Advertising Set Random Address (0x08|0x0035) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Advertising Set Random Address (0x08|0x0035) plen 7         #2410 3523.841970
        Advertising handle: 0x00
        Advertising random address: 0C:7F:C0:08:65:48 (OUI 0C-7F-C0)
> HCI Event: Command Complete (0x0e) plen 4                                       #2411 3523.842528
      LE Set Advertising Set Random Address (0x08|0x0035) ncmd 1
        Status: Success (0x00)

Environment (please complete the following information):
Commit: 0dc1875

[joerchan]

Closing since this was fixed by #27907