Support squashfs in map_file_generator am: df9821b893 am: 8c719ce916

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2620039

Change-Id: I6b695ca9f3a54e071b71eff35cc47e4a7e2cab01
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>