[ARM] 5065/2: CM-X270: Fix DM9000 IRQ flags initialisation

Add the IORESOURCE_IRQ_HIGHEDGE to the DM9000 IRQ resource
to stop the driver itself complaining it was not given
any flags to use.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>