dt-bindings: arm: Remove leftover axentia.txt

The bindings described in axentia.txt are already covered by
atmel-at91.yaml, so remove the file.

Cc: Peter Rosin <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Ludovic Desroches <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

Author: robherring

Documentation/devicetree/bindings/arm/axentia.txt

@@ -2859,7 +2859,6 @@ AXENTIA ARM DEVICES
 M:	Peter Rosin <[email protected]>
 L:	[email protected] (moderated for non-subscribers)
 S:	Maintained
-F:	Documentation/devicetree/bindings/arm/axentia.txt
 F:	arch/arm/boot/dts/at91-linea.dtsi
 F:	arch/arm/boot/dts/at91-natte.dtsi
 F:	arch/arm/boot/dts/at91-nattis-2-natte-2.dts