dt-bindings: display: amlogic, meson-vpu: Add optional power domain property

The Video Processing Unit power domain was setup by the Vendor U-Boot,
add support for an optional Power Domain phandle to setup it from the kernel.

Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Neil Armstrong <[e-mail]>
Tested-by: Jerome Brunet <[e-mail]>
Reviewed-by: Jerome Brunet <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

Documentation/devicetree/bindings/display/amlogic,meson-vpu.txt

···
 - reg-names: should contain the names of the previous memory regions
 - interrupts: should contain the VENC Vsync interrupt number
 
+Optional properties:
+- power-domains: Optional phandle to associated power domain as described in
+	the file ../power/power_domain.txt
+
 Required nodes:
 
 The connections to the VPU output video ports are modeled using the OF graph