Mark updatable APEXes

Mark updatable APEXes as updatable: true so that they are opted-out from
optimizations that make sense only for non-updatable modules; such as
symlinking to the libs in the system partition.

Bug: 149805758
Test: m and check that there is no symlink from the APEX to the system
partition.

Change-Id: Idb55300a60a261c7bb6359439ed220ff51fcf06c
diff --git a/apex/Android.bp b/apex/Android.bp
index 2f3e2ac..1a357f7 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -32,6 +32,7 @@
     compile_multilib: "both",
     prebuilts: ["com.android.os.statsd.init.rc"],
     name: "com.android.os.statsd-defaults",
+    updatable: true,
     key: "com.android.os.statsd.key",
     certificate: ":com.android.os.statsd.certificate",
 }