[rdk-b][mt7986][wifi-hal][Refactor set and get radius server functions]

[Description]
Refactor set and get radius server functions.
Config about radius authentication server setting can be set multiple times in hostapd. Thus, we use the comment to locate where the config should be replaced.
And in get function we would parse the first or second line of the configs.

[Release-log]
N/A

1 file changed