arm64: dts: apple: Add common SMC hwmon infrastructure

Apple's System Management Controller exposes the readings
from numerous sensors scattered around the SoC and elsewhere
in the machine. Some of these sensors are reliably common
on all devices, whereas others are exposed at SMC keys
specific to either the SoC or even the particular device.

To account for this and expose the right sensors for the
right device without tedious Devicetree duplication, we
can include fragments of increasing specificity in the
per-device .dts files such that the individual keys
(of which there are potentially hundreds) do not need to
be copied in for every device.

Add the initial set of SMC hwmon sensors that are common
to multiple devices so that they can be included in
the per-device Devicetrees.

Co-developed-by: Janne Grunau <j@jannau.net>
Signed-off-by: Janne Grunau <j@jannau.net>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
Link: https://patch.msgid.link/20260714-smc-subdev-dt-v2-5-13fa78873121@gmail.com
Signed-off-by: Sven Peter <sven@kernel.org>

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