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/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
new file mode 100644
index 0000000..b9772e5
--- /dev/null
+++ b/fs/squashfs/Kconfig
@@ -0,0 +1,10 @@
+config FS_SQUASHFS
+	bool "Enable SquashFS filesystem support"
+	help
+	  This provides support for reading images from SquashFS filesystem.
+	  Squashfs is a compressed read-only filesystem for Linux.
+	  It uses zlib, lz4, lzo, or xz compression to compress files, inodes
+	  and directories. Squashfs is intended for general read-only
+	  filesystem use, for archival use (i.e. in cases where a .tar.gz file
+	  may be used), and in constrained block device/memory systems (e.g.
+	  embedded systems) where low overhead is needed.