Revert "Move libmediahelper into a new folder."

This reverts commit c8888660b53647ef1a9608493ab1a5dc93ba9b0d.

Reason for revert: Broke elfin build

Change-Id: Idfd67b064b28abf32da332149bdce212249345d8
diff --git a/media/libmedia/Android.bp b/media/libmedia/Android.bp
index 67043db..ba25512 100644
--- a/media/libmedia/Android.bp
+++ b/media/libmedia/Android.bp
@@ -15,6 +15,37 @@
     ],
 }
 
+cc_library {
+    name: "libmedia_helper",
+    vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
+    double_loadable: true,
+    srcs: [
+        "AudioParameter.cpp",
+        "TypeConverter.cpp",
+    ],
+    cflags: [
+        "-Werror",
+        "-Wno-error=deprecated-declarations",
+        "-Wall",
+    ],
+    shared_libs: [
+        "libutils",
+        "liblog",
+    ],
+    header_libs: [
+        "libmedia_headers",
+        "libaudioclient_headers",
+        "libaudio_system_headers",
+    ],
+    export_header_lib_headers: [
+        "libmedia_headers",
+    ],
+    clang: true,
+}
+
 filegroup {
     name: "libmedia_omx_aidl",
     srcs: [