ipq806x: use qcom-ipq8064-v1.0.dtsi from upstream

ipq806x: use qcom-ipq8064-v1.0.dtsi from upstream

This uses upstream qcom-ipq8064-v1.0.dtsi and modifies it by patches
instead of keeping a local version. As a consequence:

- we use a part of the shared definitions there and update device
  DTS files accordingly
- we move additional stuff from our local v1.0.dtsi to the patch
- we drop partitions, LEDs and keys from the file as we will
  implement them differently anyway

Like with the previous patch, this follows the idea that a diff
from upstream might be easier to handle than a big file of our
own with different distribution pattern of properties.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>