Wifi: Add definitions for 6GHz

This commit adds some definitions for 6GHz

Bug: 139354972
Test: atest android.net.wifi
Change-Id: I2e3378a65cbf96c4249cb3c123712b8b20798dbe

core/proto/android/server/connectivity/data_stall_event.proto

@@ -32,6 +32,7 @@ enum ApBand {
     AP_BAND_UNKNOWN = 0;
     AP_BAND_2GHZ = 1;
     AP_BAND_5GHZ = 2;
+    AP_BAND_6GHZ = 3;
 }
 
 // Refer to definition in TelephonyManager.java.

wifi/java/android/net/wifi/WifiInfo.java

@@ -632,7 +632,6 @@ public class WifiInfo implements Parcelable {
 
     /**
      * @hide
-     * TODO: makes real freq boundaries
      */
     public boolean is24GHz() {
         return ScanResult.is24GHz(mFrequency);
@@ -640,13 +639,19 @@ public class WifiInfo implements Parcelable {
 
     /**
      * @hide
-     * TODO: makes real freq boundaries
      */
     @UnsupportedAppUsage
     public boolean is5GHz() {
         return ScanResult.is5GHz(mFrequency);
     }
 
+    /**
+     * @hide
+     */
+    public boolean is6GHz() {
+        return ScanResult.is6GHz(mFrequency);
+    }
+
     /**
      * Record the MAC address of the WLAN interface
      * @param macAddress the MAC address in {@code XX:XX:XX:XX:XX:XX} form