Add stdint.h to fix sim-eng

Change-Id: I82cebe3e769aa4db99bd758bd2f182b0d462de6f
diff --git a/native/include/android/input.h b/native/include/android/input.h
index 9883ac70..243c33c 100644
--- a/native/include/android/input.h
+++ b/native/include/android/input.h
@@ -40,6 +40,7 @@
  * NOTE: These functions MUST be implemented by /system/lib/libui.so
  */
 
+#include <stdint.h>
 #include <sys/types.h>
 #include <android/keycodes.h>
 #include <android/looper.h>