Exclude hbd tests from selfguided_filter_test

BUG=aomedia:2505

Change-Id: Ic29822a92234a6cbc47b3c256b1c639b79f38df9
diff --git a/test/selfguided_filter_test.cc b/test/selfguided_filter_test.cc
index 1eff1d8..03d15d7 100644
--- a/test/selfguided_filter_test.cc
+++ b/test/selfguided_filter_test.cc
@@ -218,6 +218,7 @@
     ::testing::Values(av1_apply_selfguided_restoration_neon));
 #endif
 
+#if CONFIG_AV1_HIGHBITDEPTH
 // Test parameter list:
 //  <tst_fun_, bit_depth>
 typedef tuple<SgrFunc, int> HighbdFilterTestParam;
@@ -413,4 +414,5 @@
     ::testing::Combine(::testing::Values(av1_apply_selfguided_restoration_neon),
                        ::testing::ValuesIn(highbd_params_neon)));
 #endif
+#endif  // CONFIG_AV1_HIGHBITDEPTH
 }  // namespace