tools: kwboot: Show verbose message when waiting for baudrate change magic

It is hard to debug why kwboot is failing when the last message is
'Finishing transfer' and no additional output. So show verbose message when
kwboot finished transfer and is waiting for baudrate change magic sequence.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>

tools/kwboot.c

@@ -1065,7 +1065,7 @@ kwboot_xmodem(int tty, const void *_img, size_t size, int baudrate)
 	if (baudrate) {
 		char buf[sizeof(kwb_baud_magic)];
 
-		/* Wait 1s for baudrate change magic */
+		kwboot_printv("Waiting 1s for baudrate change magic\n");
 		rc = kwboot_tty_recv(tty, buf, sizeof(buf), 1000);
 		if (rc)
 			return rc;