Do not provide 5GHz option for softap if there is no country code available

Bug:19414134
Change-Id: I88da5c3d547522263394403c97147baabae45394

wifi/java/android/net/wifi/IWifiManager.aidl

@@ -79,6 +79,8 @@ interface IWifiManager
 
     void setCountryCode(String country, boolean persist);
 
+    String getCountryCode();
+
     void setFrequencyBand(int band, boolean persist);
 
     int getFrequencyBand();

wifi/java/android/net/wifi/WifiManager.java

@@ -1237,6 +1237,21 @@ public class WifiManager {
         } catch (RemoteException e) { }
     }
 
+    /**
+    * get the country code.
+    * @return the country code in ISO 3166 format.
+    *
+    * @hide
+    */
+    public String getCountryCode() {
+       try {
+           String country = mService.getCountryCode();
+           return(country);
+       } catch (RemoteException e) {
+           return null;
+       }
+    }
+
     /**
      * Set the operational frequency band.
      * @param band  One of