ARM: dts: vfxxx: Fix dspi[01] spi-num-chipselects.

Per the Vybrid Reference Manual (section 3.8.6.1), dspi0 has 6 chip
select signals associated with it, while dspi1 has only 4.
Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com>
Acked-by: Stefan Agner <stefan@agner.ch>
Cc: <stable@vger.kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/vfxxx.dtsi

@@ -158,7 +158,7 @@ dspi0: dspi0@4002c000 {
 				interrupts = <67 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clks VF610_CLK_DSPI0>;
 				clock-names = "dspi";
-				spi-num-chipselects = <5>;
+				spi-num-chipselects = <6>;
 				status = "disabled";
 			};
 
@@ -170,7 +170,7 @@ dspi1: dspi1@4002d000 {
 				interrupts = <68 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clks VF610_CLK_DSPI1>;
 				clock-names = "dspi";
-				spi-num-chipselects = <5>;
+				spi-num-chipselects = <4>;
 				status = "disabled";
 			};