The property 'rockchip,codec' of the binding 'rockchip,rk3399-gru-sound' 
in rk3399-gru.dtsi currently is a list of all audio codecs used on devices of the gru family. This is confusing and not necessary with CL:643037.

Move the 'rockchip,codec' property down to the DT snippets of the device, and only list the codecs that the device actually has. This also allows to move codec nodes the the device snippets, for codecs that are only used on a certain device.