dt-bindings: touchscreen: Convert Goodix touchscreen to json-schema

Convert the Goodix binding to DT schema format using json-schema

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200108091118.5130-3-benjamin.gaignard@st.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>