dt: socfpga: Replace num-chipselect with num-cs

This optional DT property is called 'num-cs', so repair the misnomers.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@opensource.altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Pavel Machek <pavel@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Vince Bridgers <vbridger@opensource.altera.com>
Acked-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

arch/arm/dts/socfpga.dtsi

@@ -637,7 +637,7 @@
 			interrupts = <0 151 4>;
 			clocks = <&qspi_clk>;
 			ext-decoder = <0>;  /* external decoder */
-			num-chipselect = <4>;
+			num-cs = <4>;
 			fifo-depth = <128>;
 			bus-num = <2>;
 			status = "disabled";
@@ -649,7 +649,7 @@
 			#size-cells = <0>;
 			reg = <0xfff00000 0x1000>;
 			interrupts = <0 154 4>;
-			num-chipselect = <4>;
+			num-cs = <4>;
 			bus-num = <0>;
 			tx-dma-channel = <&pdma 16>;
 			rx-dma-channel = <&pdma 17>;
@@ -663,7 +663,7 @@
 			#size-cells = <0>;
 			reg = <0xfff01000 0x1000>;
 			interrupts = <0 156 4>;
-			num-chipselect = <4>;
+			num-cs = <4>;
 			bus-num = <1>;
 			tx-dma-channel = <&pdma 20>;
 			rx-dma-channel = <&pdma 21>;