pci: pci_mvebu: refactor validation of addresses for config access

pci: pci_mvebu: refactor validation of addresses for config access

Refactor validation of bdf parameter in mvebu_pcie_read/write_config
functions.

We can simplify the code by putting the validation into separate
function.

Also there are always only two devices visible on local bus:
* on slot configured by function mvebu_pcie_set_local_dev_nr()
  (by default this register is set to 0) there is a
  "Marvell Memory controller", which isn't useful in root complex
  mode,
* on all other slots the real PCIe card connected to the PCIe slot.

We can simplify the code even more by simply allowing access only to
the real PCIe card.

Signed-off-by: Marek Behún <[email protected]>
Cc: Stefan Roese <[email protected]>
Cc: Phil Sutter <[email protected]>
Cc: Mario Six <[email protected]>
Cc: Baruch Siach <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>