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

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

Change-Id: I252e665738adb5ea77c44583dce477a0d048c3a7