[PATCH] dt-bindings: restrict properties for sitronix,st7735r

[Sam Ravnborg]

Hi David.

> > +allOf:
> > +  - $ref: panel/panel-common.yaml#
> 
> not all of these properties are applicable.
> 

> > +required:
> > +  - compatible
> > +  - reg
> > +  - dc-gpios
> > +  - reset-gpios
> 
> Missing optional rotation and backlight properties.

Thanks for catching this. I have written a little .yaml files
since I applied this - and learned a little more of the syntax.

See attached patch for my attempt to fix this.
Please review.

	Sam