Add framework-mime-sources to stubs generation

It was used in the docs stubs generation but it doesn't have its own
(jar) stub generation. Add it to the shared non-updatable sources for
consistency.

The only class in these sources is @hide, so it makes no
immediate difference.

Test: diff android_stubs_current artifact before/after
Change-Id: I33e75623d8d71da362fb16befb78c8c7596fa400
diff --git a/Android.bp b/Android.bp
index f910cc3..8385d6e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1344,6 +1344,7 @@
 filegroup {
     name: "framework-non-updatable-stub-sources",
     srcs: [
+        ":framework-mime-sources", // mimemap builds separately but has no separate droidstubs.
         ":framework-non-updatable-sources",
         ":opt-telephony-srcs",
         ":opt-net-voip-srcs",
diff --git a/ApiDocs.bp b/ApiDocs.bp
index dcbed0d..ff3dc8d 100644
--- a/ApiDocs.bp
+++ b/ApiDocs.bp
@@ -59,7 +59,6 @@
     name: "framework-doc-stubs-default",
     srcs: [
         ":framework-non-updatable-stub-sources",
-        ":framework-mime-sources",
         ":framework-updatable-sources",
         "test-base/src/**/*.java",
         ":art.module.public.api{.public.stubs.source}",