This adds the Sparx5 basic SwitchDev driver framework with IO range
mapping, switch device detection and core clock configuration.

Support for ports, phylink, netdev, mactable etc. are in the following
patches.
Signed-off-by: NSteen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: NBjarni Jonasson <bjarni.jonasson@microchip.com>
Signed-off-by: NLars Povlsen <lars.povlsen@microchip.com>
Reviewed-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>