dt/bindings: add compatible string for versatile osc clock

Signed-off-by: NRob Herring <robh@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/clock/arm-integrator.txt

-Clock bindings for ARM Integrator Core Module clocks
+Clock bindings for ARM Integrator and Versatile Core Module clocks
 
 Auxilary Oscillator Clock
 
@@ -12,7 +12,7 @@ parent node.
 
 
 Required properties:
-- compatible: must be "arm,integrator-cm-auxosc"
+- compatible: must be "arm,integrator-cm-auxosc" or "arm,versatile-cm-auxosc"
 - #clock-cells: must be <0>
 
 Optional properties: