Added fake_libva_driver_unittest binary

Created a test for changes made in http://crrev/c/4035686. This test:
 - asserts vaMaxNumProfiles is greater than 0.
 - checks that vaQueryConfigProfiles returns VA_STATUS_SUCCESS.
 - ensures that vaQueryConfigProfiles did not include duplicate profiles
   in profile_list.

Change-Id: Ic368791a4c35838c6fd413668b8031873000e01e
Bug: b:259250376
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4034928
Commit-Queue: Grayson LaFleur <graysonlafleur@google.com>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Pilar Molina Lopez <pmolinalopez@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1084176}

diff --git a/BUILD.gn b/BUILD.gn
index 9075b6f..766f613b 100644
--- a/BUILD.gn
+++ b/BUILD.gn

@@ -1022,6 +1022,7 @@
         data_deps += [
           "//media/gpu/vaapi:decode_test",
           "//media/gpu/vaapi:vaapi_unittest",
+          "//media/gpu/vaapi/test/fake_libva_driver:fake_libva_driver_unittest",
         ]
       }
       if (use_v4l2_codec) {