Add support for the Arm PL354 static memory controller to the existing
Arm PL353 binding. Both are different configurations of the same IP with
support for different types of memory interfaces.

The 'arm,pl354' binding has already been in use upstream for a long time
in Arm development boards. The existing users have only the controller
without any child devices, so drop the required address properties
(ranges, #address-cells, #size-cells). The schema for 'ranges' is too
constrained as the order is not important and the PL354 has 8
chipselects (And the PL353 actually has up to 8 too).

The clocks aren't really correct in either case. There's 1 bus clock and
then a clock for each of the 2 memory interfaces.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221021203928.286169-1-robh@kernel.orgSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>