Revert "Temporarily comment out art-module-host-exports"

The sdk/module_exports now supports building a single snapshot for
multiple os types so art-module-host-exports should no longer cause
build breakages when building for multiple hosts.

This reverts commit 9f92d9b512c41c17b19f90cc3afa495952e17474.

Bug: 150451422
Test: m nothing
      presubmit will verify the affected builds are no longer broken
Change-Id: I7778536cb4826548fe886de0c7dabb0875c3e8fb
diff --git a/build/sdk/Android.bp b/build/sdk/Android.bp
index 63eb5cd..9a866b9 100644
--- a/build/sdk/Android.bp
+++ b/build/sdk/Android.bp
@@ -26,20 +26,6 @@
     ],
 }
 
-/*
-
-Temporarily comment out art-module-host-exports
-
-The sdk/module_exports do not support building a single snapshot for
-multiple os types. Instead it builds a separate snapshot per os type
-which would conflict when unpacked. Attempting to fix that issue is
-complicated by the fact that there are presubmit builds which rely
-on that behavior for handling the art-module-host-exports.
-
-The quickest and safest way to deal with that is to temporarily
-comment out the broken module, fix the build issues and then
-uncomment it.
-
 // Exported host tools and libraries.
 module_exports {
     name: "art-module-host-exports",
@@ -65,7 +51,6 @@
         "dex2oatd",
     ],
 }
-*/
 
 // Exported tests and supporting libraries
 module_exports {