arm64: dts: allwinner: h700: Add hp-det-gpios for Anbernic RG35XX

arm64: dts: allwinner: h700: Add hp-det-gpios for Anbernic RG35XX

Add support for headphone insertion detection via GPIO for the
RG35XX series, and add the corresponding routing to the codec node.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Ryan Walklin <ryan@testtoast.com>
Tested-by: Philippe Simons <simons.philippe@gmail.com>
--
Changelog v1..v2:
- Remove vendor prefix from GPIO description.
- Whitespace fix

Changelog v2..v3:
- Add Tested-by tag

Link: https://patch.msgid.link/20250214220247.10810-5-ryan@testtoast.com
Signed-off-by: Chen-Yu Tsai <wens@csie.org>