apm821xx: apm82181.dtsi overhaul

apm821xx: apm82181.dtsi overhaul

- order entries by mmio address where possible

 - switch to lower-case address values

 - comment on BSP u-boot behaviour in regards to
   what it edits and look for

 - annotate irq lines with the help of interrupt-names

 - remove deprecated "device_type" properties
   The pci and network device_type had to stay since
   they are required by the drivers and u-boot.
   the cpu and memory device_types will remain as well
   as they are still part of the DT Spec.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>