Add missing <malloc.h> and <string.h> includes.

Change-Id: Ia41756e607663d056e7d2fdd7ecbec7e5841a913
diff --git a/fastbootd/commands/boot.c b/fastbootd/commands/boot.c
index 922914b..bb93917 100644
--- a/fastbootd/commands/boot.c
+++ b/fastbootd/commands/boot.c
@@ -33,6 +33,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <fcntl.h>
+#include <malloc.h>
 #include <unistd.h>
 
 #include "boot.h"