PCI/ACPI: Use METHOD_NAME__UID instead of plain string

Replace the string "_UID" with the METHOD_NAME__UID macro so instances are
easier to find.

Link: https://lore.kernel.org/r/20221104032430.186424-1-zouyipeng@huawei.com


Signed-off-by: Yipeng Zou <zouyipeng@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>