dt-bindings: media: cdns,csi2rx.yaml: Add optional interrupts for cdns-csi2rx

The Cadence CSI2RX IP exposes 2 interrupts [0] 12.7 camera subsystem.
So, add support for optional interrupts and interrupt-names properties.

[0]: http://www.ti.com/lit/pdf/spruil1



Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Jai Luthra <jai.luthra@linux.dev>
Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@ti.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>