Set compile_dex for sdk prebuilts.

Bug: 160455085
Test: m
Change-Id: Ie3c000192556cda0019fb99b2568ea4920a73bed
(cherry picked from commit 19ccaca083b7707622bdc5907c6a6b10f1b94f08)
diff --git a/Android.bp b/Android.bp
index 9b7e14b..fd632a7 100644
--- a/Android.bp
+++ b/Android.bp
@@ -125,4 +125,5 @@
         "current",
     ],
     imports_sdk_version: "none",
+    imports_compile_dex: true,
 }