arm64: a37xx: dts: enable pcie port

This patch enabled PCIe port on both devel-board
and espressobin board.

Cc: Simon Glass <sjg@chromium.org>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Wilson Ding <dingwei@marvell.com>
Signed-off-by: Ken Ma <make@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>