Fix some issues due to missing _REG

Hi,

There are two issues that have been identified recently where the lack of calling ACPI _REG when devices change D-states leads to functional problems.

The first one is a case where some PCIe devices are not functional after resuming from suspend (S3 or s0ix).

The second one is a case where as the kernel is initializing it gets stuck in a busy loop waiting for AML that never returns.

In both cases this is fixed by cherry-picking these two commits:

5557b62634ab ("PCI/ACPI: Validate acpi_pci_set_power_state() parameter") 112a7f9c8edb ("PCI/ACPI: Call _REG when transitioning D-states")

Can you please backport these to 6.1.y and later?

Thanks,