This converts the Melfas MMS114 bindings and extend like this:

- Require nodename touchscreen@ (this seems to be the case for
  all in-tree DTS files)
- Add the mms134s and mms136 compatibles
- Add the avdd and vdd power supplies
- Define the I2C clock frequency property
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210330201233.2360006-1-linus.walleij@linaro.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>