wifi: hostap: Relocate source code of AP setup using hostapd to separate files

[nxf58150]

Issue:
Originally, setting up AP with wpa_supplicant is supported in modules/hostap/src/supp_*.c files. Now adding new support of setting up AP with hostapd in same files, controlled by new macro CONFIG_WIFI_NM_HOSTAPD_AP. This implementation is not easy to maintain in the future.

Solution:
Relocate the hostapd support source code to new files and place those files under modules/hostap/src. Update CMAKE file so that those files will only be included and compiled when CONFIG_WIFI_NM_HOSTAPD_AP is enabled.

[nxf58150]

@krish2718
Hi Chaitanya,
Created this issue to track the hostapd support relocation task. Could you please help add this issue to Wi-Fi project.
Thanks!

Regards,
Hui Bai