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/wrapper/Android.bp b/media/libeffects/lvm/wrapper/Android.bp
index 09c4aef..e169e3c 100644
--- a/media/libeffects/lvm/wrapper/Android.bp
+++ b/media/libeffects/lvm/wrapper/Android.bp
@@ -67,6 +67,7 @@
     },
 
     vendor: true,
+    host_supported: true,
     srcs: ["Reverb/EffectReverb.cpp"],
 
     cppflags: [
@@ -83,7 +84,6 @@
     shared_libs: [
         "libaudioutils",
         "libcutils",
-        "libdl",
         "liblog",
     ],