fix some compile error

chip/zuart.cpp

@@ -2,7 +2,9 @@
 
 #include <stdio.h>
 #include <string.h>
-
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
 using namespace iflytop;
 
 static ZUART *s_uart_table[10];

components/key_monitor/key_service.cpp

@@ -1,4 +1,7 @@
 #include "key_service.hpp"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
 using namespace iflytop;
 #define TAG "KeyService"
 void KeyService::initialize(int keyBufferSize, KeyListener_t listener) {
@@ -73,4 +76,4 @@ void KeyService::periodicJob() {
   for (int i = 0; i < m_numKey; i++) {
     processKey(&m_keys[i]);
   }
-}
+}