spi: dw: Rename "cs-gpio" to "cs-gpios"

This property is named differently than other SPI drivers with the same
property, as well as the property as used in Linux.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Tested-by Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arc/dts/axs10x_mb.dtsi b/arch/arc/dts/axs10x_mb.dtsi
index 33b0593..daf7ca6 100644
--- a/arch/arc/dts/axs10x_mb.dtsi
+++ b/arch/arc/dts/axs10x_mb.dtsi
@@ -97,7 +97,8 @@
 			spi-max-frequency = <4000000>;
 			clocks = <&apbclk>;
 			clock-names = "spi_clk";
-			cs-gpio = <&cs_gpio 0>;
+			num-cs = <1>;
+			cs-gpios = <&cs_gpio 0>;
 			spi_flash@0 {
 				compatible = "jedec,spi-nor";
 				reg = <0>;