pci: pci_mvebu: Add DM_PCI support and move CONFIG_PCI_MVEBU to defconfig

pci: pci_mvebu: Add DM_PCI support and move CONFIG_PCI_MVEBU to defconfig

This patch adds DM_PCI support to the MVEBU PCIe driver. This is
necessary, since all PCI drivers have to be moved to DM (driver model)
until the v2019.07 release.

To not break git bisect'ablility, this patch also moves CONFIG_PCI_MVEBU
from config headers to the defconfig files.

Signed-off-by: Stefan Roese <[email protected]>
Cc: Dirk Eibach <[email protected]>
Cc: Mario Six <[email protected]>
Cc: Chris Packham <[email protected]>
Cc: Phil Sutter <[email protected]>
Cc: Marek Behún <[email protected]>
Cc: VlaoMao <[email protected]>