esp_hw_support/esp_system: Re-evaluate header inclusions and include directories

This commit updates the visibility of various header files and cleans up
some unnecessary inclusions. Also, this commit removes certain header
include paths which were maintained for backward compatibility.

components/mqtt/test/test_mqtt.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  *
@@ -22,6 +22,7 @@
 #include "sdkconfig.h"
 #include "test_mqtt_client_broker.h"
 #include "test_mqtt_connection.h"
+#include "esp_mac.h"
 
 static void test_leak_setup(const char * file, long line)
 {

components/mqtt/test/test_mqtt_client_broker.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -7,6 +7,7 @@
 #include "freertos/event_groups.h"
 #include "mqtt_client.h"
 #include "esp_log.h"
+#include "esp_mac.h"
 
 #define WAIT_FOR_EVENT(event) \
     TEST_ASSERT_TRUE(xEventGroupWaitBits(s_event_group, event, pdTRUE, pdTRUE, pdMS_TO_TICKS(COMMON_OPERATION_TIMEOUT)) & event);