ASoC: dt-bindings: Fix RT5677 "realtek,gpio-config" type

ASoC: dt-bindings: Fix RT5677 "realtek,gpio-config" type

"realtek,gpio-config" is described as six 8-bit GPIO configuration
values, and the RT5677 driver stores and reads those values as bytes.
The binding incorrectly documented the property as a uint32 array.

Document "realtek,gpio-config" as a uint8-array so the generated
schema matches the hardware definition and the existing driver helper.

Assisted-by: Codex:gpt-5-5
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260612214911.1883234-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>