fs/squashfs: add filesystem commands

Add 'ls' and 'load' commands.

Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index c2501e8..8ec6c5d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -974,6 +974,7 @@
 S:	Maintained
 F:	fs/squashfs/
 F:	include/sqfs.h
+F:	cmd/sqfs.c
 
 TARGET_BCMNS3
 M:	Bharat Gooty <bharat.gooty@broadcom.com>