EffectBundleTest: Move helper class to a separate file

This helps in extending the tests for other effects

Bug: 178513382
Test: atest EffectBundleTest
Test: atest --host EffectBundleTest

Change-Id: Id830e4b8cb496a2ac7a83c6efc3c6ed0144859b5
diff --git a/media/libeffects/lvm/tests/Android.bp b/media/libeffects/lvm/tests/Android.bp
index 639af4d..c078112 100644
--- a/media/libeffects/lvm/tests/Android.bp
+++ b/media/libeffects/lvm/tests/Android.bp
@@ -15,7 +15,10 @@
     gtest: true,
     host_supported: true,
     test_suites: ["device-tests"],
-    srcs: ["EffectBundleTest.cpp"],
+    srcs: [
+        "EffectBundleTest.cpp",
+        "EffectTestHelper.cpp",
+    ],
     static_libs: [
         "libaudioutils",
         "libbundlewrapper",