dt-bindings: display: arm,komeda: add Arm China Linlon D6 compatible

dt-bindings: display: arm,komeda: add Arm China Linlon D6 compatible

Add the Arm China Linlon D6 display controller compatible string.

Linlon D6 is register-compatible with Mali-D71, so describe it as a
vendor-specific compatible with a fallback to "arm,mali-d71".

Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Cunyuan Liu <cunyuan.liu@cixtech.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patch.msgid.link/20260313033119.33686-3-cunyuan.liu@cixtech.com