ACPI: fan: Use thermal_cooling_device_create()

Instead of using thermal_cooling_device_register() for
registering a cooling device in the ACPI fan driver, make it use
thermal_cooling_device_create() and pass a pointer to the platform
device representing the given fan to that function as the cooling
device's parent.  That will cause the cooling device's sysfs directory
to be created under the parent's sysfs directory (among other things).

Since creating a class device under a parent causes a "device" symbolic
link from the sysfs directory of the class device to the sysfs directory
of the parent to appear automatically, remove the code creating that
symbolic link manually.

Moreover, since the cooling device is now located in sysfs under its
parent and it can be easily identified as a cooling device, there is
no need to create a "thermal_cooling" symbolic link from its parent
to it.  Accordingly, also remove the code creating that symbolic link.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Link: https://patch.msgid.link/3969045.kQq0lBPeGt@rafael.j.wysocki

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