ACPI: PAD: Switch over to devres-based resource management

Use the newly introduced devm_acpi_install_notify_handler() for
installing an ACPI notify handler and since that function checks the
ACPI companion of the owner device against NULL internally, remove the
the explicit ACPI companion check from acpi_pad_probe().

However, to prevent the notify handler from running acpi_pad_idle_cpus()
with the number of idle CPUs greater than zero after acpi_pad_remove()
has returned, add a bool static variable for synchronization between
the two.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/1964581.CQOukoFCf9@rafael.j.wysocki

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