MediaTranscoding: Add libmediatranscoder to the service.

Otherwise, the library will not get build by default.

Bug: 145233472
Test: Build and run.
Change-Id: Ia13aebad4678cc6a6a0004c0bd70cb820dcf35de
diff --git a/media/libmediatranscoding/Android.bp b/media/libmediatranscoding/Android.bp
index 6d8c03d..e3e87e1 100644
--- a/media/libmediatranscoding/Android.bp
+++ b/media/libmediatranscoding/Android.bp
@@ -45,6 +45,7 @@
         "libcutils",
         "liblog",
         "libutils",
+        "libmediatranscoder",
     ],
 
     export_include_dirs: ["include"],