Multiple persistent object manipulation

xtest 6014 is introduced. It highlights an issue when persistent
objects are manipulated in a loop.
cf. https://github.com/OP-TEE/optee_os/issues/798

Signed-off-by: Pascal Brand <pascal.brand@st.com>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Tested-by: Joakim Bech <joakim.bech@linaro.org> (QEMU)
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/ta/storage/include/storage.h b/ta/storage/include/storage.h
index a736197..d5609d2 100644
--- a/ta/storage/include/storage.h
+++ b/ta/storage/include/storage.h
@@ -48,5 +48,6 @@
 TEE_Result ta_storage_cmd_next_enum(uint32_t param_types, TEE_Param params[4]);
 TEE_Result ta_storage_cmd_key_in_persistent(uint32_t param_types,
 					    TEE_Param params[4]);
+TEE_Result ta_storage_cmd_loop(uint32_t param_types, TEE_Param params[4]);
 
 #endif /*STORAGE_H */