pci: ftpci100: add new driver implementation

Add a new DM driver supporting FTPCI100 IP used in SoC designs.
This implementation is not based on the old non-DM ftpci100 code
dropped from U-Boot.

Enable the driver in sandbox_defconfig to test compilability.

Signed-off-by: Sergei Antonov <saproj@gmail.com>
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index a712a31..72ef8b4 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -14,6 +14,7 @@
 obj-$(CONFIG_PCIE_ECAM_GENERIC) += pcie_ecam_generic.o
 obj-$(CONFIG_PCIE_ECAM_SYNQUACER) += pcie_ecam_synquacer.o
 obj-$(CONFIG_PCIE_APPLE) += pcie_apple.o
+obj-$(CONFIG_PCI_FTPCI100) += pci_ftpci100.o
 obj-$(CONFIG_PCI_GT64120) += pci_gt64120.o
 obj-$(CONFIG_PCI_MPC85XX) += pci_mpc85xx.o
 obj-$(CONFIG_PCI_MSC01) += pci_msc01.o