Device-registry and device-hubs for Surface System Aggregator Module
(SSAM) devices.

Provides a module and driver which act as a device-registry for SSAM
client devices that cannot be detected automatically, e.g. via ACPI.
Such devices are instead provided via this registry and attached via
device hubs, also provided in this module.

Devices provided via this registry are:
- Platform profile (performance-/cooling-mode) device (5th- and later
generations).
- Battery/AC devices (7th-generation).
- HID input devices (7th-generation).

Select M (recommended) or Y here if you want support for the above
mentioned devices on the corresponding Surface models. Without this
module, the respective devices will not be instantiated and thus any
functionality provided by them will be missing, even when drivers for
these devices are present. In other words, this module only provides
the respective client devices. Drivers for these devices still need to
be selected via the other options.

source code:

drivers/platform/surface/surface_aggregator_registry.c