mfd: intel_soc_pmic: Use CPU-id check instead of _HRV check to differentiate variants

The Intel Crystal Cove PMIC has 2 different variants, one for use with
Bay Trail (BYT) SoCs and one for use with Cherry Trail (CHT) SoCs.

So far we have been using an ACPI _HRV check to differentiate between
the 2, but at least on the Microsoft Surface 3, which is a CHT device,
the wrong _HRV value is reported by ACPI.

So instead switch to a CPU-ID check which prevents us from relying on
the possibly wrong ACPI _HRV value.

Signed-off-by: Hans de Goede <[email protected]>
Reported-by: Tsuchiya Yuto <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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