dt-bindings: thermal: amlogic: describe bus clock for t7-thermal

The t7 thermal sensor needs a bus clock, in addition to the existing
functional clock, to gate register access to the sensor. This bus
clock is specific to each sensor, unlike the functional clock which
is shared between sensors. The current binding only describes a
single unnamed clock and therefore cannot represent this hardware
requirement, so add a second clock entry and clock-names for clarity.
Make the second clock mandatory for the t7-thermal compatible only,
via an additional if/then/else, to avoid breaking other Amlogic SoCs
that still use a single clock. Update the t7 example to match.

Fixes: b1c8ccdbd4e9 ("dt-bindings: thermal: amlogic: Add support for T7")
Signed-off-by: Ronald Claveau <linux-kernel-dev@aliel.fr>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260923-fix-t7-thermal-clock-v2-1-bff7a09eb487@aliel.fr

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