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.

Exempt-From-Owner-Approval: cherry-pick from internal

Merged-In: Idb55300a60a261c7bb6359439ed220ff51fcf06c
(cherry picked from commit 8201bdfab070fb2b93a997947095fad003060da9)
Change-Id: Idb55300a60a261c7bb6359439ed220ff51fcf06c
diff --git a/Android.bp b/Android.bp
index 100d7e9..a22a948 100644
--- a/Android.bp
+++ b/Android.bp
@@ -27,6 +27,7 @@
 
 apex_defaults {
     name: "com.android.sdkext-defaults",
+    updatable: true,
     java_libs: [ "framework-sdkextensions" ],
     prebuilts: [
         "derive_sdk.rc",