Homogenize configuration option name.

Rename '--enable-aom-highbitdepth' to '--enable-highbitdepth'

Change-Id: I1de13c3508c30c552532993419d8ace326142ab6
diff --git a/test/warp_filter_test.cc b/test/warp_filter_test.cc
index 305559e..fd6608b 100644
--- a/test/warp_filter_test.cc
+++ b/test/warp_filter_test.cc
@@ -16,7 +16,7 @@
 using std::tr1::make_tuple;
 using libaom_test::ACMRandom;
 using libaom_test::AV1WarpFilter::AV1WarpFilterTest;
-#if CONFIG_AOM_HIGHBITDEPTH
+#if CONFIG_HIGHBITDEPTH
 using libaom_test::AV1HighbdWarpFilter::AV1HighbdWarpFilterTest;
 #endif
 
@@ -27,7 +27,7 @@
 INSTANTIATE_TEST_CASE_P(SSE2, AV1WarpFilterTest,
                         libaom_test::AV1WarpFilter::GetDefaultParams());
 
-#if CONFIG_AOM_HIGHBITDEPTH
+#if CONFIG_HIGHBITDEPTH
 TEST_P(AV1HighbdWarpFilterTest, CheckOutput) {
   RunCheckOutput(av1_highbd_warp_affine_ssse3);
 }