Increase heap size for lint tool

We perodically get java.lang.OutOfMemoryError: Java heap space errors
on the build servers, increase the lint heap size from 2GB to 3GB.

Bug: 161151611
Test: m lint-check
Change-Id: Id6cb97871e01780ac8761647c6d3a504fbfb49f2
diff --git a/java/lint.go b/java/lint.go
index 6fbef18..fc65c0b 100644
--- a/java/lint.go
+++ b/java/lint.go
@@ -231,7 +231,7 @@
 
 	rule.Command().
 		Text("(").
-		Flag("JAVA_OPTS=-Xmx2048m").
+		Flag("JAVA_OPTS=-Xmx3072m").
 		FlagWithArg("ANDROID_SDK_HOME=", homeDir.String()).
 		FlagWithInput("SDK_ANNOTATIONS=", annotationsZipPath).
 		FlagWithInput("LINT_OPTS=-DLINT_API_DATABASE=", apiVersionsXMLPath).