Revert "ACPI / LPSS: allow to use specific PM domain during ->probe()"

Revert "ACPI / LPSS: allow to use specific PM domain during ->probe()"

The specific power domain can't be used in a way provided by the commit
1b13e48f4aa5, i.e. pointer to platform device is a subject to change during
unbound / bind cycle.

This reverts commit 1b13e48f4aa5dd26d2cca0975fa77d93e0ce95cc.

Fixes: d417b9d53423 (Revert "ACPI / LPSS: introduce a 'proxy' device to power on LPSS for DMA")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>