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

commit 897ed0ca upstream.

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>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
[ kamal: backport to 3.19-stable: only dspi0 in 3.19 ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

arch/arm/boot/dts/vfxxx.dtsi

@@ -128,7 +128,7 @@ dspi0: dspi0@4002c000 {
 				reg = <0x4002c000 0x1000>;
 				clocks = <&clks VF610_CLK_DSPI0>;
 				clock-names = "dspi";
-				spi-num-chipselects = <5>;
+				spi-num-chipselects = <6>;
 				status = "disabled";
 			};