Many boards use a USB vendor id of 0x4321. This doesn't exist and
shouldn't be used. Remove this and also the bogus product id of 0x1234.
The boards will use the barebox default vendor/product id then.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Refactor to remove duplicated code without changing functionality.
Put "then" on the same line of "if", because:
 - is the most used style in barebox
 - is like c code style
 - is more compact

Reduce the number of lines from 50 to 40.

Tested on at91sam9260ek.

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

use ds3 for heartbeat and ds5 for dfu

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

if bp3 is pressed 5s during boot enable dfu otherwise usbserial

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

configure BP4 and BP3

use BP4 to start DFU mode at boot

if BP4 is pressed at boot time and maintain at least 5s the dfu is started
otherwise we boot normaly

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>