arm64: dts: juno: Describe PCI dma-ranges

The PLDA root complex on Juno relies on an address-based lookup table to
generate AXI attributes for inbound PCI transactions, and as such will
not pass any transaction not matching any programmed address range. The
standard firmware configuration programs 3 entries covering the GICv2m
MSI doorbell and the 2 DRAM regions, so add a "dma-ranges" property to
describe those usable inbound windows.

Link: https://lore.kernel.org/r/720d0a9a42e33148fcac45cd39a727093a32bf32.1614965598.git.robin.murphy@arm.com


Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>