wifi: Add legacy HAL stubs

This is a port of all the existing stub functions from HalTool. Will
deprecate and remove HalTool once framework switches over to HIDL.
These stubs are important because the vendor implementations don't fill
a function pointer in the table (when |init_wifi_vendor_hal_func_table| is
invoked) if they don't implement that feature.

Bug: 33540636
Test: Gtests
Change-Id: Ia41c4faa30b517731a162f3999d64a3f2c34e058
diff --git a/wifi/1.0/default/wifi_legacy_hal.h b/wifi/1.0/default/wifi_legacy_hal.h
index 27ffa71..07bc93a 100644
--- a/wifi/1.0/default/wifi_legacy_hal.h
+++ b/wifi/1.0/default/wifi_legacy_hal.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef WIFI_LEGACY_WIFI_HAL_H_
-#define WIFI_LEGACY_WIFI_HAL_H_
+#ifndef WIFI_LEGACY_HAL_H_
+#define WIFI_LEGACY_HAL_H_
 
 #include <functional>
 #include <thread>
@@ -270,4 +270,4 @@
 }  // namespace hardware
 }  // namespace android
 
-#endif  // WIFI_LEGACY_WIFI_HAL_H_
+#endif  // WIFI_LEGACY_HAL_H_