Revert^2 "Add the 'bdev_type' attribute to all block devices" am: 03b647d205 am: c050e67988 am: 4a49da307b am: 882c5775b3 am: 086d8bb428

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1862222

Change-Id: I076b79a5277f5fc0e5e01abd75e9c4259cb65add