Remove Mockito from static libs in android.car.testapi

Having Mockito as a static lib in the testapi can cause it to conflict
with a local version of Mockito. Have mockito load dynamically instead
and use the local version of Mockito in the classpath of the app using
the testapi library.

Test: . build/envsetup.sh && lunch hawk-userdebug
make -jN RunCarLibTests

Change-Id: I9941b881a7f5bcd9b286bf483e79bca6da956442
diff --git a/car-test-lib/Android.bp b/car-test-lib/Android.bp
index aaa9138..e4282b0 100644
--- a/car-test-lib/Android.bp
+++ b/car-test-lib/Android.bp
@@ -25,6 +25,8 @@
     static_libs: [
         "android.car",
         "car-service-lib-for-test",
+    ],
+    libs: [
         "mockito",
     ],
     installable: false,