ARM: dts: Remove unused properties from FSL QSPI driver nodes

The properties 'bus-num', 'fsl,spi-num-chipselects' and
'fsl,spi-flash-chipselects' were never read by the driver
and can be removed.
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a-moxa-uc-8410a.dts

@@ -203,9 +203,6 @@ rgmii_phy2: ethernet-phy@2 {
 };
 
 &qspi {
-	bus-num = <0>;
-	fsl,spi-num-chipselects = <2>;
-	fsl,spi-flash-chipselects = <0>;
 	fsl,qspi-has-second-chip;
 	status = "okay";