Update paths to match west layout

Bug: b/267213895
Change-Id: Ifa3c6905ff32073e439a4271bf7694eb21db59e5
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-manifest/+/139271
Reviewed-by: Alexei Frolov <frolv@google.com>
Commit-Queue: Rob Mohr <mohrr@google.com>
diff --git a/manifest.xml b/default.xml
similarity index 76%
rename from manifest.xml
rename to default.xml
index 27cced7..c209264 100644
--- a/manifest.xml
+++ b/default.xml
@@ -10,14 +10,10 @@
 	<project name="zephyr"
 		remote="zephyrproject-rtos"
 		path="zephyr"/>
-	<project name="nanopb"
-		remote="zephyrproject-rtos"
-		revision="zephyr"
-		path="nanopb"/>
 	<project name="pigweed"
 		remote="pigweed"
-		path="workspace/pigweed"/>
+		path="pigweed"/>
 	<project name="zephyr-integration"
 		remote="pigweed"
-		path="."/>
+		path="zephyr-integration"/>
 </manifest>