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/Kconfig b/drivers/pci/Kconfig
index 74e514a..463ec47 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -127,6 +127,12 @@
 	  Say Y here if you want to enable PCIe controller support on
 	  Apple SoCs.
 
+config PCI_FTPCI100
+	bool "Enable Faraday FTPCI100 PCI Bridge Controller driver"
+	help
+	  Say Y here if you want to enable Faraday FTPCI100 PCI.
+	  FTPCI100 IP is used in SoC chip designs.
+
 config PCI_GT64120
 	bool "GT64120 PCI support"
 	depends on MIPS