docs: dt: convert dynamic-resolution-notes.txt to ReST

- Add a SPDX header;
- Adjust document title;
- Add it to devicetree/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>