arm64: a37xx: pci: add support for aardvark pcie driver

This patch introduced the Aardvark PCIe driver based
driver model.
The PCIe driver is supposed to work in Root Complex
mode. It only supports X1 lane width.

Signed-off-by: Wilson Ding <dingwei@marvell.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/38725


Reviewed-by: Victor Gu <xigu@marvell.com>
Reviewed-by: Hua Jing <jinghua@marvell.com>
Tested-by: Hua Jing <jinghua@marvell.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Ken Ma <make@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>