ARM: LPC32xx: Adjust device tree node to new standard num-cs

In spi-pl022.c, the new device tree binding is now "num-cs" for the number of
chip selects. Further, pl022,hierarchy and pl022,slave-tx-disable isn't
supported in favour of reasonable defaults in the driver.

Adjusting phy3250.dts to it.
Signed-off-by: Roland Stigge <stigge@antcom.de>

arch/arm/boot/dts/phy3250.dts

@@ -135,13 +135,11 @@ isp1301: usb-transceiver@2c {
 			ssp0: ssp@20084000 {
 				#address-cells = <1>;
 				#size-cells = <0>;
-				pl022,num-chipselects = <1>;
+				num-cs = <1>;
 				cs-gpios = <&gpio 3 5 0>;
 
 				eeprom: at25@0 {
-					pl022,hierarchy = <0>;
 					pl022,interface = <0>;
-					pl022,slave-tx-disable = <0>;
 					pl022,com-mode = <0>;
 					pl022,rx-level-trig = <1>;
 					pl022,tx-level-trig = <1>;