dt-bindings: input: Goodix GT7986U SPI HID Touchscreen

dt-bindings: input: Goodix GT7986U SPI HID Touchscreen

The Goodix GT7986U touch controller report touch data according to the
HID protocol through the SPI bus. However, it is incompatible with
Microsoft's HID-over-SPI protocol.

NOTE: these bindings are distinct from the bindings used with the
GT7986U when the chip is running I2C firmware. For some background,
see discussion on the mailing lists in the thread:

https://lore.kernel.org/r/20241018020815.3098263-2-charles.goodix@gmail.com

Signed-off-by: Charles Wang <charles.goodix@gmail.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>