dt-bindings: display: convert himax,hx8357d.txt to yaml format

dt-bindings: display: convert himax,hx8357d.txt to yaml format

Convert himax,hx8357d.txt to yaml format.

Additional changes:
- add spi parent node in examples.
- ref to spi-peripheral-props.yaml.
- change himax,hx8357a to himax,hx8357 to align driver and existed dts.
- add himax,hx8369a and fallback to himax,hx8369.
- allow spi-cpha and spi-cpol to align existed dts.
- add im-gpios for interface selections.
- add reset-gpios.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250602152814.949671-1-Frank.Li@nxp.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>