dt-bindings: thermal: Convert da906{1,2} thermal to json-schema

Convert the da906{1,2} thermal device tree binding documentation to
json-schema.

Update MAINTAINERS entries and description by referring to
dlg,da9062-thermal.yaml binding file.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240131102656.3379-5-biju.das.jz@bp.renesas.com


Signed-off-by: Lee Jones <lee@kernel.org>