Convert the Silicon Image sii902x HDMI bridge Device Tree binding
documentation to json-schema.

Add missing sil,sii9022-cpi and sil,sii9022-tpi compatible values.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/2f8e12b4980a82788c1dd413ceedf8d144fdca91.1652967387.git.geert+renesas@glider.be