test: fs: disable the metadata checksums on ext4 filesystems

If the metadata checksums are enabled, all write operations will fail.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/test/py/tests/test_fs/conftest.py b/test/py/tests/test_fs/conftest.py
index 43eeb4b..745ed0e 100644
--- a/test/py/tests/test_fs/conftest.py
+++ b/test/py/tests/test_fs/conftest.py
@@ -143,6 +143,8 @@
         mkfs_opt = '-F 16'
     elif fs_type == 'fat32':
         mkfs_opt = '-F 32'
+    elif fs_type == 'ext4':
+        mkfs_opt = '-O ^metadata_csum'
     else:
         mkfs_opt = ''