Wifi: Handle subsystem restart notification

This commit adds the logic to handle a notification of a wifi subsystem
restart to trigger the callback to the framework for self recovery.

Bug: 159367026
Test: force a firmware restart and make sure Wifi is recovered.
Change-Id: If6b5863d1d7473917088ec5be1910fa0db5dd6ae
diff --git a/wifi/1.4/default/wifi_chip.h b/wifi/1.4/default/wifi_chip.h
index 98e18bb..e7650bd 100644
--- a/wifi/1.4/default/wifi_chip.h
+++ b/wifi/1.4/default/wifi_chip.h
@@ -50,13 +50,14 @@
  */
 class WifiChip : public V1_4::IWifiChip {
    public:
-    WifiChip(
-        ChipId chip_id,
-        const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal,
-        const std::weak_ptr<mode_controller::WifiModeController>
-            mode_controller,
-        const std::weak_ptr<iface_util::WifiIfaceUtil> iface_util,
-        const std::weak_ptr<feature_flags::WifiFeatureFlags> feature_flags);
+    WifiChip(ChipId chip_id,
+             const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal,
+             const std::weak_ptr<mode_controller::WifiModeController>
+                 mode_controller,
+             const std::weak_ptr<iface_util::WifiIfaceUtil> iface_util,
+             const std::weak_ptr<feature_flags::WifiFeatureFlags> feature_flags,
+             const std::function<void(const std::string&)>&
+                 subsystemCallbackHandler);
     // HIDL does not provide a built-in mechanism to let the server invalidate
     // a HIDL interface object after creation. If any client process holds onto
     // a reference to the object in their context, any method calls on that
@@ -282,6 +283,8 @@
     hidl_callback_util::HidlCallbackHandler<IWifiChipEventCallback>
         event_cb_handler_;
 
+    const std::function<void(const std::string&)> subsystemCallbackHandler_;
+
     DISALLOW_COPY_AND_ASSIGN(WifiChip);
 };