qa/suites/rbd: run c api tests on immutable object cache

Signed-off-by: Mykola Golub <mgolub@suse.com>

diff --git a/qa/suites/rbd/immutable-object-cache/workloads/c_api_tests_with_defaults.yaml b/qa/suites/rbd/immutable-object-cache/workloads/c_api_tests_with_defaults.yaml
new file mode 120000 (symlink)
index 0000000..9490327
--- /dev/null
+++ b/qa/suites/rbd/immutable-object-cache/workloads/c_api_tests_with_defaults.yaml
@@ -0,0 +1 @@
+../../librbd/workloads/c_api_tests_with_defaults.yaml
\ No newline at end of file