PCI: Add dev & res local variables to resource assignment funcs

Many PCI resource allocation related functions process struct
pci_dev_resource items which hold the struct pci_dev and resource pointers.
Reduce the number of lines that need indirection by adding 'dev' and 'res'
local variable to hold the pointers.

Link: https://lore.kernel.org/r/20241216175632.4175-12-ilpo.jarvinen@linux.intel.com


Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Xiaochun Lee <lixc17@lenovo.com>