fs/squashfs: add filesystem commands

Add 'ls' and 'load' commands.

Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 6ac274e..23d7e27 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2090,6 +2090,12 @@
 	help
 	  Support for the FAT fs
 
+config CMD_SQUASHFS
+	bool "SquashFS command support"
+	select FS_SQUASHFS
+	help
+	  Enables SquashFS filesystem commands (e.g. load, ls).
+
 config CMD_FS_GENERIC
 	bool "filesystem commands"
 	help