[rdkb][common][hal][Fix Guard Interval setting issue]

[Description]
Fix Guard Interval setting issue
1. setting didn't write into flash. So after reboot, hostapd config didn't match the config of wifi agent

[Release-log]

1 file changed
tree: 9a386a8d2eb2bbbe3a3376ef906aa205b2d9c0ee
  1. src/