Effect AIDL: Move AIDL effects installation path to soundfx

Bug: 258124419
Test: build and boot cuttlefish, check logcat for lib loading.
Test: atest EffectsFactoryHalInterfaceTest
Change-Id: Id5d341ec1be45ac7640b9fff7b8a538beb335855
diff --git a/media/libeffects/visualizer/Android.bp b/media/libeffects/visualizer/Android.bp
index fb9d7b7..cf782f7 100644
--- a/media/libeffects/visualizer/Android.bp
+++ b/media/libeffects/visualizer/Android.bp
@@ -70,6 +70,7 @@
     shared_libs: [
         "libcutils",
     ],
+    relative_install_path: "soundfx",
     visibility: [
         "//hardware/interfaces/audio/aidl/default",
     ],