test/py: Add tests for the erofs

Add Python scripts to test 'ls' and 'load' commands, as well as
test related filesystem functions.

Signed-off-by: Huang Jianan <jnhuang95@gmail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 3e7ae7e5..f25ca7c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -816,6 +816,7 @@
 F:	cmd/erofs.c
 F:	fs/erofs/
 F:	include/erofs.h
+F:	test/py/tests/test_fs/test_erofs.py
 
 EVENTS
 M:	Simon Glass <sjg@chromium.org>