Replace use of deprecated C Standard library headers in C++ code.

Change-Id: I9fa6630c7e4bdb2897df34d417635d8c7d8253bc
Signed-off-by: Tyler Chatow <tchatow@gmail.com>
diff --git a/aos/print_field_helpers.h b/aos/print_field_helpers.h
index 933ce46..fdfd1c6 100644
--- a/aos/print_field_helpers.h
+++ b/aos/print_field_helpers.h
@@ -1,13 +1,12 @@
 #ifndef AOS_PRINT_FIELD_HELPERS_H_
 #define AOS_PRINT_FIELD_HELPERS_H_
 
-#include <stdint.h>
-
+#include <cstdint>
 #include <type_traits>
 
 namespace aos {
 
-template<typename T>
+template <typename T>
 inline bool PrintInteger(char *buf, T val, size_t *output) {
   static const bool is_signed = ::std::is_signed<T>::value;
   const bool is_negative =