ARM: imx6: gw54xx: use wdog1 for barebox ...

As Barebox isn't changing the external PMIC power rails the internal
watchdog reset is fine for the Barebox reset purposes. Watchdog 2 is
only usable on boards with revision E or later, as this on is incapable
of executing an internal reset.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: imx6: do not include arm/imx6q.dtsi from barebox imx6q.dtsi ...

Instead, let each board dts file that needs it include <arm/imx6q.dtsi>
manually before "imx6q.dtsi". This way board dts files that include the
original board dts and include "imxq6.dtsi" on top of that without
disabling all peripherals.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: imx6: add Gateworks Ventana board ...

For now only the Quad 1GB variant is supported.

Tested:
- starting barebox over USB
- writing barebox to NAND with barebox_update
- starting Linux kernel over TFTP

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>