Make change and version bump to r_aml_300900600 for mainline module file: manifest.json

Change-Id: I05d276c4e870fadfb317b4d3cea2f9ec5c13d1a1
diff --git a/manifest.json b/manifest.json
index 7c089da..a102213 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,4 +1,4 @@
 {
   "name": "com.android.sdkext",
-  "version": 309999900
+  "version": 300900600
 }