Add aapt to aapt2_artifacts

Adds aapt to aapt2_artifacts dist target so the binary will appear
in the ub-aapt2-release branch.

Bug: 175789289
Test: none
Change-Id: I8963eecfd7667196fc3651a00d9a744cddd2c24b
diff --git a/tools/aapt/Android.bp b/tools/aapt/Android.bp
index c75ba71..a19d183 100644
--- a/tools/aapt/Android.bp
+++ b/tools/aapt/Android.bp
@@ -124,6 +124,9 @@
     srcs: ["Main.cpp"],
     use_version_lib: true,
     static_libs: ["libaapt"],
+    dist: {
+        targets: ["aapt2_artifacts"],
+    },
 }
 
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