pci_ep: add Cadence PCIe endpoint driver

Add Cadence PCIe endpoint driver supporting configuration
of header, bars and MSI for device.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pci_endpoint/Makefile b/drivers/pci_endpoint/Makefile
index 80a1066..0a849de 100644
--- a/drivers/pci_endpoint/Makefile
+++ b/drivers/pci_endpoint/Makefile
@@ -4,3 +4,4 @@
 # Ramon Fried <ramon.fried@gmail.com>
 
 obj-y += pci_ep-uclass.o
+obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o