Remove libmediaextractor

Move DataSourceBase and MediaSource to libstagefright, and
MediaBuffer, MediaBufferGroup and MetaData to libstagefright_foundation.

Test: build

Change-Id: I4f0ae01d40a32f4b773a2f74d5f2ae136e375322
diff --git a/media/extractors/mpeg2/Android.bp b/media/extractors/mpeg2/Android.bp
index b816093..2a94671 100644
--- a/media/extractors/mpeg2/Android.bp
+++ b/media/extractors/mpeg2/Android.bp
@@ -28,9 +28,8 @@
 
     static_libs: [
         "libcrypto",
-        "libstagefright_foundation",
+        "libstagefright_foundation_without_imemory",
         "libstagefright_mpeg2support",
-        "libmediaextractor",
         "libutils",
         "libstagefright",
         "libstagefright_esds",