arm64: dts: marvell: enable additional PCIe ports on Armada 8040 DB

The Armada 8040 DB has numerous PCIe ports, so let's enable a few more
of those PCIe ports that are enabled in the default bootloader
configuration.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>