Add Tegra PCIe client driver to provide Tegra to Tegra communication
support via network protocol. This driver creates a network interface and
the data transfer is initiated by CPU write. Endpoint trigger MSI
interrupts are to inform the host about pending rx packets.

bug 2312071

Change-Id: I585e00f79c04d3624853c9499bd2b929563821c5
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2012360
GVS: Gerrit_Virtual_Submit
Reviewed-by: Ian Stewart <istewart@nvidia.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

Adding Makefile/Kconfig for Realtek r8168 driver.

Bug 200388150

Change-Id: I669a3d7caed5a79f48ca7de486e12de7bdeac961
Signed-off-by: Daniel Fu <danifu@nvidia.com>