bx50v3 boards can be powered off via GPIO, this patch specifies the GPIO to
be used with the gpio-poweroff driver.
Signed-off-by: NKen Lin <ken.lin@advantech.com.tw>
Signed-off-by: NAkshay Bhat <akshay.bhat@timesys.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>