spi: dt-bindings: Rename spi-cs-setup-ns to spi-cs-setup-delay-ns

Other delay values follow the delay-ns naming convention, so unify the
newly introduced spi-cs-setup-ns property for consistency.

Also fix a typo while we're here.

Fixes: f6c911f ("spi: dt-bindings: Introduce spi-cs-setup-ns property")
Signed-off-by: Hector Martin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: marcan

Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml

@@ -44,9 +44,9 @@ properties:
     description:
       Maximum SPI clocking speed of the device in Hz.
 
-  spi-cs-setup-ns:
+  spi-cs-setup-delay-ns:
     description:
-      Delay in nanosecods to be introduced by the controller after CS is
+      Delay in nanoseconds to be introduced by the controller after CS is
       asserted.
 
   spi-rx-bus-width: