xtest 6012: Persistent File Creation

Test with specific persistent file creation:
optional object (can be NULL), and creation overwrite
using flag TEE_DATA_FLAG_OVERWRITE, on an existing file.

This reproduces https://github.com/OP-TEE/optee_os/issues/745

Change-Id: I6ed67a94e006325971e9ae494cd588d90586d964
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Pascal Brand <pascal.brand@st.com>
diff --git a/ta/storage/include/storage.h b/ta/storage/include/storage.h
index 3767666..0dd8e16 100644
--- a/ta/storage/include/storage.h
+++ b/ta/storage/include/storage.h
@@ -32,6 +32,7 @@
 
 TEE_Result ta_storage_cmd_open(uint32_t param_types, TEE_Param params[4]);
 TEE_Result ta_storage_cmd_create(uint32_t param_types, TEE_Param params[4]);
+TEE_Result ta_storage_cmd_create_overwrite(uint32_t param_types, TEE_Param params[4]);
 TEE_Result ta_storage_cmd_close(uint32_t param_types, TEE_Param params[4]);
 TEE_Result ta_storage_cmd_read(uint32_t param_types, TEE_Param params[4]);
 TEE_Result ta_storage_cmd_write(uint32_t param_types, TEE_Param params[4]);