AAPT2: Expose split support to command line

Bug:30445078
Change-Id: If4b8530dba71b9059b8e62c04757da99c1119d22
diff --git a/tools/aapt2/split/TableSplitter.h b/tools/aapt2/split/TableSplitter.h
index 15e0764..2fa5c47 100644
--- a/tools/aapt2/split/TableSplitter.h
+++ b/tools/aapt2/split/TableSplitter.h
@@ -60,7 +60,7 @@
 
     void splitTable(ResourceTable* originalTable);
 
-    const std::vector<std::unique_ptr<ResourceTable>>& getSplits() {
+    std::vector<std::unique_ptr<ResourceTable>>& getSplits() {
         return mSplits;
     }