ARM: mx6: Add PCI express driver

Add PCIe driver for the Freescale i.MX6 SoC . This driver operates the
PCIe block in RC mode only, the EP mode is NOT supported. The driver is
tested with the Intel e1000 NIC driver.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Eric Nelson <eric.nelson@boundarydevices.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 6182a59..18458d3 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -10,6 +10,7 @@
 obj-$(CONFIG_PCI_INDIRECT_BRIDGE) += pci_indirect.o
 obj-$(CONFIG_PCI_GT64120) += pci_gt64120.o
 obj-$(CONFIG_PCI_MSC01) += pci_msc01.o
+obj-$(CONFIG_PCIE_IMX) += pcie_imx.o
 obj-$(CONFIG_FTPCI100) += pci_ftpci100.o
 obj-$(CONFIG_IXP_PCI) += pci_ixp.o
 obj-$(CONFIG_SH4_PCI) += pci_sh4.o