ACPI: processor: idle: Introduce too_many_states() for _LPI

To reduce code duplication, introduce a function called too_many_states()
that will check if the total number of _LPI states for a given CPU is
too large and print a message in that case.

Use that function in flatten_lpi_states() and acpi_processor_get_lpi_info().

No functional impact beyond reducing dynamic debug flexibility.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Sudeep Holla <sudeep.holla@kernel.org>
Acked-by: Huisong Li <lihuisong@huawei.com>
Link: https://patch.msgid.link/1964818.CQOukoFCf9@rafael.j.wysocki

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