Change default version code for Mainline modules building from source to start with 3520

BUG:344610650

Ignore-AOSP-First: We are currently blocked on internal testing of mainline modules by these version code issues, but are unclear if this is correct behavior for AOSP. We'd like to submit this in the interest of unblocking the testing, and will resolve the question in AOSP thereafter.

Change-Id: I64ddf6215ddfe33e180a54bf8a98092da8286808
diff --git a/android/updatable_modules.go b/android/updatable_modules.go
index dd7dc2c..d2595ed 100644
--- a/android/updatable_modules.go
+++ b/android/updatable_modules.go
@@ -33,4 +33,4 @@
 // * AOSP            - xx9990000
 // * x-mainline-prod - xx9990000
 // * master          - 990090000
-const DefaultUpdatableModuleVersion = "350090000"
+const DefaultUpdatableModuleVersion = "352090000"