libeffects: Add host support for reverb modules

- Removed __unused that is not supported by host toolchain
- Removed unused libdl dependency from libreverbwrapper

Bug: 180116440
Test: run reverb_benchmark on host

Change-Id: Id44248fe3ad77650199bc624ba32e8ad373b4abe
diff --git a/media/libeffects/lvm/tests/Android.bp b/media/libeffects/lvm/tests/Android.bp
index 8627c13..f38a846 100644
--- a/media/libeffects/lvm/tests/Android.bp
+++ b/media/libeffects/lvm/tests/Android.bp
@@ -54,7 +54,7 @@
 
 cc_test {
     name: "reverb_test",
-    host_supported: false,
+    host_supported: true,
     proprietary: true,
 
     include_dirs: [