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 <sr@denx.de>
Cc: Dirk Eibach <dirk.eibach@gdsys.cc>
Cc: Mario Six <mario.six@gdsys.cc>
Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: Phil Sutter <phil@nwl.cc>
Cc: Marek BehĂșn <marek.behun@nic.cz>
Cc: VlaoMao <vlaomao@gmail.com>
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index f59803d..1521885 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -112,4 +112,13 @@
 	  Say Y here if you want to enable PCIe controller support on Intel
 	  FPGA, example Stratix 10.
 
+config PCI_MVEBU
+	bool "Enable Armada XP/38x PCIe driver"
+	depends on ARCH_MVEBU
+	select DM_PCI
+	select MISC
+	help
+	  Say Y here if you want to enable PCIe controller support on
+	  Armada XP/38x SoCs.
+
 endif