soc: xilinx: vcu: use vcu-settings syscon registers

soc: xilinx: vcu: use vcu-settings syscon registers

Switch the "logicoreip" registers to the new xlnx,vcu-settings binding
to be able to read the settings if the settings are specified in a
separate device tree node that is shared with other drivers.

If the driver is not able to find a node with the new binding, fall back
to check for the logicore register bank to be backwards compatible.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Hyun Kwon <hyun.kwon@xilinx.com>
Link: https://lore.kernel.org/r/20201109134818.4159342-4-m.tretter@pengutronix.de
Signed-off-by: Michal Simek <michal.simek@xilinx.com>