regression 6020: fix fs_open() flags

The flag TEE_DATA_FLAG_OVERWRITE is not permitted with the
TEE_OpenPersistentObject() functions. So remove the flag where needed in
the 6020 case.

Reviewed-by: Jerome Forissier <jerome@forissier.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/host/xtest/regression_6000.c b/host/xtest/regression_6000.c
index 2fcf586..a002c45 100644
--- a/host/xtest/regression_6000.c
+++ b/host/xtest/regression_6000.c
@@ -2123,8 +2123,7 @@
 				TA_STORAGE_CMD_OPEN_ID_IN_SHM,
 				file_01, sizeof(file_01),
 				TEE_DATA_FLAG_ACCESS_WRITE |
-				TEE_DATA_FLAG_ACCESS_WRITE_META |
-				TEE_DATA_FLAG_OVERWRITE,
+				TEE_DATA_FLAG_ACCESS_WRITE_META,
 				0,
 				NULL, 0,
 				&obj,
@@ -2161,8 +2160,7 @@
 
 	res = fs_open(&sess, file_01, sizeof(file_01),
 				TEE_DATA_FLAG_ACCESS_WRITE |
-				TEE_DATA_FLAG_ACCESS_WRITE_META |
-				TEE_DATA_FLAG_OVERWRITE,
+				TEE_DATA_FLAG_ACCESS_WRITE_META,
 				&obj,
 				storage_id);
 
@@ -2190,8 +2188,7 @@
 
 	res = fs_open(&sess, file_01, sizeof(file_01),
 				TEE_DATA_FLAG_ACCESS_WRITE |
-				TEE_DATA_FLAG_ACCESS_WRITE_META |
-				TEE_DATA_FLAG_OVERWRITE,
+				TEE_DATA_FLAG_ACCESS_WRITE_META,
 				&obj,
 				storage_id);