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

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

Change-Id: Icd1ff37c625479239a2412540182d24661fdf8dc