ACPI: property: Use acpi_dev_for_each_child() for child lookup

Instead of using the list of children of an ACPI device directly,
use acpi_dev_for_each_child() to find the next child of a given
ACPI device.

This will help to eliminate the children list head from struct
acpi_device as it is redundant and it is used in questionable ways
in some places (in particular, locking is needed for walking the
list pointed to it safely, but it is often missing).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

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