Mark cc_test as not gtest since they are not gtest

Test: None
Bug: 179092189
Change-Id: Iba92250609a4c4cd691d5365e9644e8d8ed55a58
diff --git a/media/libeffects/preprocessing/tests/Android.bp b/media/libeffects/preprocessing/tests/Android.bp
index 1860add..cfa6559 100644
--- a/media/libeffects/preprocessing/tests/Android.bp
+++ b/media/libeffects/preprocessing/tests/Android.bp
@@ -29,6 +29,7 @@
         "libaudioeffects",
         "libhardware_headers",
     ],
+    gtest: false,
 }
 
 cc_test {
@@ -40,4 +41,5 @@
         "-Werror",
         "-Wextra",
     ],
+    gtest: false,
 }