Fix ClangTidy misc-include-cleaner warnings

A follow-up to commit 80386bf and commit ec0949b.

Change-Id: I316ca6cc9bff9d498d1edaf8836be9b4a2c1c411

aom_dsp/bitreader_buffer.c

diff --git a/aom_dsp/bitreader_buffer.c b/aom_dsp/bitreader_buffer.c
index 48331c8..df153df 100644
--- a/aom_dsp/bitreader_buffer.c
+++ b/aom_dsp/bitreader_buffer.c
@@ -10,6 +10,7 @@
  */
 
 #include <assert.h>
+#include <stdint.h>
 
 #include "config/aom_config.h"
 

common/av1_config.c

diff --git a/common/av1_config.c b/common/av1_config.c
index 4447f91..b37d8dc 100644
--- a/common/av1_config.c
+++ b/common/av1_config.c
@@ -8,6 +8,7 @@
  * Media Patent License 1.0 was not distributed with this source code in the
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */
+#include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 

test/bitwriter_buffer_test.cc

diff --git a/test/bitwriter_buffer_test.cc b/test/bitwriter_buffer_test.cc
index b1ba78a..5fae09c 100644
--- a/test/bitwriter_buffer_test.cc
+++ b/test/bitwriter_buffer_test.cc
@@ -9,6 +9,8 @@
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */
 
+#include <cstdint>
+
 #include "gtest/gtest.h"
 
 #include "aom_dsp/bitwriter_buffer.h"