Rename sdkext module to sdkextensions

It's a better name.

Bug: 137191822
Test: presubmit
Change-Id: Icc39779d49bf31f911f9f72bd7610e84c5f49466
Merged-In: Icc39779d49bf31f911f9f72bd7610e84c5f49466
(cherry picked from commit 5b97269cffa587d1c1d73163a9cabb0cc8c7ec05)
diff --git a/Android.bp b/Android.bp
index 27f22bd..f776bcd 100644
--- a/Android.bp
+++ b/Android.bp
@@ -265,7 +265,7 @@
 filegroup {
     name: "framework-updatable-sources",
     srcs: [
-        ":framework-sdkext-sources",
+        ":framework-sdkextensions-sources",
         ":framework-tethering-srcs",
         ":updatable-media-srcs",
     ]
@@ -463,7 +463,7 @@
     static_libs: [
         "framework-minus-apex",
         "updatable_media_stubs",
-        "framework-sdkext-stubs-systemapi",
+        "framework-sdkextensions-stubs-systemapi",
         // TODO(jiyong): add more stubs for APEXes here
     ],
     sdk_version: "core_platform",