The register ranges of the device nodes timer@20300 and watchdog@20300
overlap, so it is impossible that both devices properly use
request_iomem_region (e.g. by using dev_request_mem_resource). In Linux
only the watchdog driver is registered in /proc/iomem, do the same for
barebox.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>