Disable kythe indexing of R files

https://r.android.com/3207856 special-cased kythe builds to always
generate R.srcjar files. Some of the R.java files are too big to be
processed by kythe (b/397132972#comment43), so disable R.srcjar generation.

Bug: 397132972
Test: XREF_CORPUS=blah m nothing #verified that R.srcjar is not present
in .ninja files

Change-Id: Ifadf6418c221adb144b10212becac1d6901e951f
diff --git a/java/aar.go b/java/aar.go
index 0e27cb8..ebada65 100644
--- a/java/aar.go
+++ b/java/aar.go
@@ -219,11 +219,7 @@
 func (a *aapt) useResourceProcessorBusyBox(ctx android.BaseModuleContext) bool {
 	return BoolDefault(a.aaptProperties.Use_resource_processor, true) &&
 		// TODO(b/331641946): remove this when ResourceProcessorBusyBox supports generating shared libraries.
-		!slices.Contains(a.aaptProperties.Aaptflags, "--shared-lib") &&
-		// Use the legacy resource processor in kythe builds.
-		// The legacy resource processor creates an R.srcjar, which kythe can use for generating crossrefs.
-		// TODO(b/354854007): Re-enable BusyBox in kythe builds
-		!ctx.Config().EmitXrefRules()
+		!slices.Contains(a.aaptProperties.Aaptflags, "--shared-lib")
 }
 
 func (a *aapt) filterProduct() string {