block/nand: QOM casting sweep
Define and use standard QOM cast macro. Remove usages of DO_UPCAST and direct -> style casting. Cc: afaerber@suse.de Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com> Reviewed-by: NAndreas Färber <afaerber@suse.de> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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