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

Change-Id: Ia41756e607663d056e7d2fdd7ecbec7e5841a913
diff --git a/fastbootd/transport.c b/fastbootd/transport.c
index 232c999..3ba0e9a 100644
--- a/fastbootd/transport.c
+++ b/fastbootd/transport.c
@@ -19,6 +19,7 @@
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <sys/mman.h>