pcie: ti: add driver for AM65x PCIe RC

Add driver supporting PCIe root-complex available
on TI's AM65x SoC.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 3fe38f7..bdfc0c1 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -145,4 +145,10 @@
 	  Say Y here if you want to enable PCIe controller support on
 	  Armada XP/38x SoCs.
 
+config PCI_KEYSTONE
+	bool "TI Keystone PCIe controller"
+	depends on DM_PCI
+	help
+	  Say Y here if you want to enable PCI controller support on AM654 SoC.
+
 endif