dt-bindings: clock: imx8m: Add missing interrupt property

All i.MX8M SoC have 2 CCM interrupts, called:
* Interrupt Request 1
* Interrupt Request 2

Signed-off-by: Alexander Stein <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Abel Vesa <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Abel Vesa <[e-mail]>

Documentation/devicetree/bindings/clock/imx8m-clock.yaml

···
   reg:
     maxItems: 1
 
+  interrupts:
+    maxItems: 2
+
   clocks:
     minItems: 6
     maxItems: 7