drivers/usart: Replace malloc.h with stdlib.h
usart_kiss.c is not static yet and still has one more call to calloc()
in csp_usart_open_and_add_kiss_interface().
Because malloc.h is non standard, use stdlib.h instead.
@@ -21,7 +21,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#include <csp/interfaces/csp_if_kiss.h>
#include <stdio.h>
-#include <malloc.h>
+#include <stdlib.h>
#include <csp/csp.h>
#include <csp/drivers/usart.h>
