thermal/of: Pass cdev_id and introduce devm registration helper

Extend the OF cooling device registration to support an explicit
cooling device identifier (cdev_id), preparing for upcoming DT
bindings where cooling devices are identified by a tuple (device node,
id) instead of relying on child nodes.

Introduce a new helper:

  devm_thermal_of_cooling_device_register()

which registers a cooling device using the device's of_node and an
explicit cdev_id. This complements the existing
devm_thermal_of_child_cooling_device_register() helper, which
remains dedicated to the legacy child-node based bindings.

Internally, factorize the devm registration logic into a common
helper to avoid code duplication.

Existing users are unaffected, as the child-based helper continues
to pass a default cdev_id of 0, preserving current behavior.

This change is a preparatory step for supporting indexed cooling
devices in thermal OF bindings.

Signed-off-by: Daniel Lezcano <daniel.lezcano@oss.qualcomm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
Link: https://patch.msgid.link/20260526140802.1059293-20-daniel.lezcano@oss.qualcomm.com

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