ACPI / x86: Revert: Make PWM2 device always present at Lenovo Yoga Book

It turns out that there is a WMI object which controls the PWM2 device
used for the keyboard backlight and that WMI object also provides some
other useful functionality.

The upcoming lenovo-yogabook-wmi driver will offer both backlight
control and the other functionality, so there no longer is a need
to have the lpss-pwm driver binding to PWM2 for backlight control;
and this is now actually undesirable because this will cause both
the WMI code and the lpss-pwm driver to poke at the same PWM
controller.

Revert commit ff6cdfd7 ("ACPI / x86: Make PWM2 device always present
at Lenovo Yoga Book"), removing the always-present quirk for the PWM2
ACPI-device, so that the lpss-pwm controller will no longer bind to it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Yauhen Kharuzhy <jekhor@gmail.com>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>