Separate out ESDS as a static lib

A static lib, libstagefright_esds, is added so that it can be used
only when needed in the extractor implementation.

Test: build
Bug: 65851881
Change-Id: I06a6d8816f1241eb8b37a997cff8a9d36d237b96
diff --git a/media/extractors/mp4/Android.bp b/media/extractors/mp4/Android.bp
index c1e299e..49a3714 100644
--- a/media/extractors/mp4/Android.bp
+++ b/media/extractors/mp4/Android.bp
@@ -14,12 +14,12 @@
     shared_libs: [
         "liblog",
         "libmediaextractor",
-        "libstagefright",  // Needed for ESDS
         "libstagefright_foundation",
         "libutils",
     ],
 
     static_libs: [
+        "libstagefright_esds",
         "libstagefright_id3",
     ],