common.py: Add support for squashfs

Change-Id: Ia40f8c6307d0213d43207aee91c4c8a5b5ad6f1e
Signed-off-by: Mohamad Ayyash <mkayyash@google.com>
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index d0b9e57..e05ee3c 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -1224,7 +1224,8 @@
     "mtd": "MTD",
     "ext4": "EMMC",
     "emmc": "EMMC",
-    "f2fs": "EMMC"
+    "f2fs": "EMMC",
+    "squashfs": "EMMC"
 }
 
 def GetTypeAndDevice(mount_point, info):