Revert "Revert^2 "Add the 'bdev_type' attribute to all block devices"" am: 307752944c am: 0b7dade969 am: fd45d3616c

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1861987

Change-Id: I8141750d082018704494c5f0787920abd1c04e26