selftest: sync: fence tests for sw_sync framework

These tests are based on the libsync test suite from Android.
This commit includes tests for basic fence creation.

Signed-off-by: Emilio López <emilio.lopez@collabora.co.uk>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/sync/synctest.h

@@ -44,4 +44,8 @@ int test_alloc_timeline(void);
 int test_alloc_fence(void);
 int test_alloc_fence_negative(void);
 
+/* Fence tests with one timeline */
+int test_fence_one_timeline_wait(void);
+int test_fence_one_timeline_merge(void);
+
 #endif