[rdkb][common][app][Refactor hostapd-init.sh]

[Description]
Refactor hostapd-init.sh
1. support tri-band

[Release-log]

diff --git a/recipes-connectivity/hostapd/files/hostapd-6G.conf b/recipes-connectivity/hostapd/files/hostapd-6G.conf
index 874ef7e..cb0576b 100644
--- a/recipes-connectivity/hostapd/files/hostapd-6G.conf
+++ b/recipes-connectivity/hostapd/files/hostapd-6G.conf
@@ -7,11 +7,10 @@
 beacon_int=100
 dtim_period=2
 
-country_code=DE
+country_code=US
 ieee80211d=1
 ieee80211h=1
 channel=37
-chanlist=37
 
 tx_queue_data2_burst=2.0
 ieee80211n=1