ACPI: x86/rtc-cmos: Use platform device for driver binding

Modify the rtc-cmos driver to bind to a platform device on systems with
ACPI via acpi_match_table and advertise the CMOST RTC ACPI device IDs
for driver auto-loading.  Note that adding the requisite device IDs to
it and exposing them via MODULE_DEVICE_TABLE() is sufficient for this
purpose.

Since the ACPI device IDs in question are the same as for the CMOS RTC
ACPI scan handler, put them into a common header file and use the
definition from there in both places.

Additionally, to prevent a PNP device from being created for the CMOS
RTC if a platform one is present already, make is_cmos_rtc_device()
check cmos_rtc_platform_device_present introduced previously.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://patch.msgid.link/13969123.uLZWGnKmhe@rafael.j.wysocki

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