DO NOT MERGE ANYWHERE - Update master-ndk-vulkan-validation-layers to use main branch.

Bug: b/289400079
Change-Id: If1416ad63ebe3fa943a01be6a32e0a2d7fcab9bb
diff --git a/default.xml b/default.xml
index dce602a..3735ae0 100644
--- a/default.xml
+++ b/default.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <manifest>
   <![CDATA[
-    Manifest for building NDK Vulkan validation layer binaries from master.
+    Manifest for building NDK Vulkan validation layer binaries from main.
 
     Uses prebuilt python.
 
@@ -18,7 +18,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="master"
+  <default revision="main"
            remote="aosp"
            sync-j="4" />