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>

Documentation/devicetree/dynamic-resolution-notes.txt → Documentation/devicetree/dynamic-resolution-notes.rst

+.. SPDX-License-Identifier: GPL-2.0
+
+==================================
 Device Tree Dynamic Resolver Notes
-----------------------------------
+==================================
 
 This document describes the implementation of the in-kernel
 Device Tree resolver, residing in drivers/of/resolver.c

Documentation/devicetree/index.rst

@@ -10,3 +10,4 @@ Open Firmware and Device Tree
    usage-model
    writing-schema
    changesets
+   dynamic-resolution-notes

Documentation/devicetree/overlay-notes.txt

@@ -3,7 +3,7 @@ Device Tree Overlay Notes
 
 This document describes the implementation of the in-kernel
 device tree overlay functionality residing in drivers/of/overlay.c and is a
-companion document to Documentation/devicetree/dynamic-resolution-notes.txt[1]
+companion document to Documentation/devicetree/dynamic-resolution-notes.rst[1]
 
 How overlays work
 -----------------

MAINTAINERS

@@ -12535,7 +12535,7 @@ M:	Pantelis Antoniou <pantelis.antoniou@konsulko.com>
 M:	Frank Rowand <frowand.list@gmail.com>
 L:	devicetree@vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/dynamic-resolution-notes.txt
+F:	Documentation/devicetree/dynamic-resolution-notes.rst
 F:	Documentation/devicetree/overlay-notes.txt
 F:	drivers/of/overlay.c
 F:	drivers/of/resolver.c