allow overlay extraction on other ramdisk types
Currently, only .cpio[.gz] is supported when extracting overlays (e.g. modules) into a ramdisk. Supporting other fs types (ext2/3/4) would also be useful. Originally filed as https://bugs.linaro.org/show_bug.cgi?id=3042
Migrated from https://projects.linaro.org/browse/LAVA-1204
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