pw_watch: Watch for changes to *.dts/dtsi files

Change-Id: I5afbf94ef00c78ee55b75d682baffa0a71f87ac8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/110392
Commit-Queue: Christoph Klee <chklee@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
diff --git a/pw_watch/py/pw_watch/watch.py b/pw_watch/py/pw_watch/watch.py
index f8df9f2..445a33b 100755
--- a/pw_watch/py/pw_watch/watch.py
+++ b/pw_watch/py/pw_watch/watch.py
@@ -553,6 +553,8 @@
     '*.cpp',
     '*.cmake',
     'CMakeLists.txt',
+    '*.dts',
+    '*.dtsi',
     '*.gn',
     '*.gni',
     '*.go',