Add the 'bdev_type' attribute to all block devices am: 7e190bde80 am: 015ebbeb21 am: f135d54ebc am: 9d46687d77 am: eeade91cbd

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1796007

Change-Id: I8ed21e726aaf2f45c1729d9e51da99cbd90df0b1