Convert media effects to Android.bp

See build/soong/README.md for more information.

Also removed some obsolete subdirs entries.

Test: m MODULES-IN-frameworks-av-media-libeffects
Change-Id: I1111197a62cc0e856159bfa0d650c5c36b20890a
diff --git a/media/libeffects/loudness/Android.bp b/media/libeffects/loudness/Android.bp
new file mode 100644
index 0000000..5a13af6
--- /dev/null
+++ b/media/libeffects/loudness/Android.bp
@@ -0,0 +1,27 @@
+// LoudnessEnhancer library
+cc_library_shared {
+    name: "libldnhncr",
+
+    vendor: true,
+    srcs: [
+        "EffectLoudnessEnhancer.cpp",
+        "dsp/core/dynamic_range_compression.cpp",
+    ],
+
+    cflags: [
+        "-O2",
+        "-fvisibility=hidden",
+
+        "-Wall",
+        "-Werror",
+    ],
+
+    shared_libs: [
+        "libcutils",
+        "liblog",
+    ],
+
+    relative_install_path: "soundfx",
+
+    header_libs: ["libaudioeffects"],
+}