spi: pl022: remove nonexistent properties from DT binding example

The properties "pl022,hierarchy" and "pl022,slave-tx-disable" were
initially proposed till patch V4 [1] but then discarded in V5 [2]
when the patch set was taken over by another developer, as
explained in patch history in [3].
The above properties never landed in mainline code but were then
listed in the binding example by a following commit dc715452
("spi: pl022: use generic DMA slave configuration if possible")
and later on they were copy-paste in some board's DT.

Remove the nonexistent properties from the example.
Also remove a spaces-only line at the end of the file.

[1] https://lkml.org/lkml/2012/7/9/421
[2] https://lkml.org/lkml/2012/8/21/427
[3] https://lkml.org/lkml/2012/8/21/436Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/spi_pl022.txt

@@ -56,9 +56,7 @@ Example:
 			spi-max-frequency = <12000000>;
 			spi-cpol;
 			spi-cpha;
-			pl022,hierarchy = <0>;
 			pl022,interface = <0>;
-			pl022,slave-tx-disable;
 			pl022,com-mode = <0x2>;
 			pl022,rx-level-trig = <0>;
 			pl022,tx-level-trig = <0>;
@@ -67,4 +65,3 @@ Example:
 			pl022,duplex = <0>;
 		};
 	};
-