RSMI: Fix incorrect PCI BDF bits

The specs for rsmi_dev_pci_id_get() say this:

Domain   [64:32]
Reserved [31:16]
Bus      [15: 8]
Device   [ 7: 3]
Function [ 2: 0]

Notably, the bus was truncated by 3 bits, and the domain and reserved
sections were swapped and had incorrect widths.

Bug 11577