Move dumpOatRules to platform_bootclasspath

Bug: 177892522
Test: m oat-dump-boot
      - test output to make sure that this change does not change the
        generated files, at least no more than no changes do as the
	output from this rule is not deterministic. See b/186459873.

Change-Id: Ib2b4203d9bb1fd0ee9443aee4e58b54b38b491cf
diff --git a/java/platform_bootclasspath.go b/java/platform_bootclasspath.go
index 3b27ef6..6bf9ea0 100644
--- a/java/platform_bootclasspath.go
+++ b/java/platform_bootclasspath.go
@@ -328,4 +328,6 @@
 
 	// Generate the updatable bootclasspath packages rule.
 	generateUpdatableBcpPackagesRule(ctx, imageConfig, updatableModules)
+
+	dumpOatRules(ctx, imageConfig)
 }