fs/squashfs: new filesystem

Add support for SquashFS filesystem. Right now, it does not support
compression but support for zlib will be added in a follow-up commit.

Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 889a73f..c2501e8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -969,6 +969,12 @@
 F:	drivers/spmi/
 F:	include/spmi/
 
+SQUASHFS
+M:	Joao Marcos Costa <joaomarcos.costa@bootlin.com>
+S:	Maintained
+F:	fs/squashfs/
+F:	include/sqfs.h
+
 TARGET_BCMNS3
 M:	Bharat Gooty <bharat.gooty@broadcom.com>
 M:	Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>