Make LMS public key export part of public key api

Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/tests/suites/test_suite_lms.function b/tests/suites/test_suite_lms.function
index 425e994..e4c4b91 100644
--- a/tests/suites/test_suite_lms.function
+++ b/tests/suites/test_suite_lms.function
@@ -97,7 +97,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_LMS_PRIVATE */
+/* BEGIN_CASE */
 void lms_import_export_test (  data_t * pub_key )
 {
     mbedtls_lms_public_t ctx;