Wifi: Add 6GHz bands to WifiBand

This commit adds 6GHz band to WifiBand and update the impacted
structures and methods in Wifi HAL.
Note that Background scar related HAL API will not be using the
new band, and will continue with the legacy set of bands.

Bug: 139354972
Test: Manual
Test: VTS test
Test: Unit test: ./hardware/interfaces/wifi/1.4/default/tests/runtests.sh
Change-Id: I54662251034806338ad64d4622ade259ca260a79
diff --git a/wifi/1.4/IWifiChip.hal b/wifi/1.4/IWifiChip.hal
index d269427..de5a64e 100644
--- a/wifi/1.4/IWifiChip.hal
+++ b/wifi/1.4/IWifiChip.hal
@@ -19,6 +19,7 @@
 import @1.0::WifiStatus;
 import @1.0::IWifiIface;
 import @1.3::IWifiChip;
+import IWifiChipEventCallback;
 import IWifiRttController;
 
 /**
@@ -26,6 +27,22 @@
  */
 interface IWifiChip extends @1.3::IWifiChip {
     /**
+     * Requests notifications of significant events on this chip. Multiple calls
+     * to this must register multiple callbacks each of which must receive all
+     * events.
+     *
+     * @param callback An instance of the |IWifiChipEventCallback| HIDL interface
+     *        object.
+     * @return status WifiStatus of the operation.
+     *         Possible status codes:
+     *         |WifiStatusCode.SUCCESS|,
+     *         |WifiStatusCode.ERROR_NOT_SUPPORTED|,
+     *         |WifiStatusCode.ERROR_WIFI_CHIP_INVALID|
+     */
+    registerEventCallback_1_4(IWifiChipEventCallback callback)
+        generates (WifiStatus status);
+
+    /**
      * Create a RTTController instance.
      *
      * RTT controller can be either: