usbreset: Add missing header

Fixes undefined reference to strtoul

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry picked from commit 653e05d27f)

package/utils/usbreset/src/usbreset.c

@@ -37,6 +37,7 @@ Alan Stern
 */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <stdbool.h>
 #include <unistd.h>
 #include <fcntl.h>