kernel: 5.10: silence bogus "Missing #address-cells in interrupt provider" warnings

kernel: 5.10: silence bogus "Missing #address-cells in interrupt provider" warnings

Rosen reported strange dtc warnings that had their origin in
an upstream patch to 5.8-rc1. Upon further digging this
revealed an ongoing thread [0] discussing the topic:

> [...]I don't think we need a bunch of warning fix patches to add
> these everywhere. Also, the need for #address-cells pretty much makes
> no sense on any modern system. It is a relic from days when the bus
> (address) topology and interrupt topology were related.

and later on:
> So really, we only need to be checking for #address-cells in nodes
> with interrupt-map.

This patch backports just the patch which removed the warning message
(this is from the upstream dtc project [1] - but not the kernel).
the patch does not add the checking of the #address-cells in nodes
with interrupt-map.

[0] <https://lore.kernel.org/linux-devicetree/91e3405245c89f134676449cf3822285798d2ed2.1612189652.git.michal.simek@xilinx.com/>
[1] <https://git.kernel.org/pub/scm/utils/dtc/dtc.git/commit/?id=d8d1a9a77863a8c7031ae82a1d461aa78eb72a7b>
Link: <https://github.com/openwrt/openwrt/pull/4685>
Reported-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>