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/Makefile b/drivers/pci/Makefile
index b5ebd50..e54a98b 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -38,3 +38,4 @@
 				pcie_layerscape_gen4_fixup.o
 obj-$(CONFIG_PCI_XILINX) += pcie_xilinx.o
 obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o
+obj-$(CONFIG_PCI_KEYSTONE) += pcie_dw_ti.o