Remove sdk extensions from module_lib / system_server api databases

We want these lint api-versions.xml files to only have the
non-updatable apis, and sdk extensions are updatable.

Bug: 193460475
Test: Presubmits
Change-Id: I06698e0eec0c388cff223288ac3c6abe109ea713
diff --git a/StubLibraries.bp b/StubLibraries.bp
index d043464..38413c2 100644
--- a/StubLibraries.bp
+++ b/StubLibraries.bp
@@ -546,7 +546,8 @@
         "api-versions-jars-dir",
     ],
     api_levels_sdk_type: "module-lib",
-    extensions_info_file: ":sdk-extensions-info",
+    // extensions_info_file is purposefully omitted, because this module should just be
+    // the non-updatable portions of the sdk, and extension sdks are updatable.
 }
 
 droidstubs {
@@ -563,7 +564,8 @@
         "api-versions-jars-dir",
     ],
     api_levels_sdk_type: "system-server",
-    extensions_info_file: ":sdk-extensions-info",
+    // extensions_info_file is purposefully omitted, because this module should just be
+    // the non-updatable portions of the sdk, and extension sdks are updatable.
 }
 
 /////////////////////////////////////////////////////////////////////