Re-enable ThinLTO for libmedia_jni and libaudioeffect_jni

This partially reverts commit cd1e70b8.

Breakages are fixed in the current stable Clang.

Test: presubmit
Bug: 169004486
Change-Id: I545553eccf9ed83864158087c5746923c3d452d5

media/jni/Android.bp

@@ -122,11 +122,6 @@ cc_library_shared {
         "-Wunused",
         "-Wunreachable-code",
     ],
-
-    // Workaround Clang LTO crash.
-    lto: {
-        never: true,
-    },
 }
 
 cc_library_shared {

media/jni/audioeffect/Android.bp

@@ -44,9 +44,4 @@ cc_library_shared {
         "-Wunreachable-code",
         "-DANDROID_UTILS_REF_BASE_DISABLE_IMPLICIT_CONSTRUCTION",
     ],
-
-    // Workaround Clang LTO crash.
-    lto: {
-        never: true,
-    },
 }