dt-bindings: touchscreen: goodix: support of gt9147

Add support for it by adding compatible.
The chip data on GT9147 is similar to GT912, like
- config data register has 0x8047 address
- config data register max len is 240
- config data checksum has 8-bit
Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1583144308-3781-2-git-send-email-yannick.fertre@st.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/touchscreen/goodix.yaml

@@ -21,6 +21,7 @@ properties:
       - goodix,gt911
       - goodix,gt9110
       - goodix,gt912
+      - goodix,gt9147
       - goodix,gt917s
       - goodix,gt927
       - goodix,gt9271