Revert "Add the 'bdev_type' attribute to all block devices" am: 9cc4be8057 am: bad107fcb1 am: 8b5a94ca3a am: 6d618a3c26 am: 1992886843

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1850577

Change-Id: I7f282ab4869e61109ff1f9ba50ad049b723129f5