Revert "jfs: Convert to bdev_open_by_dev()"

This reverts commit 9641706c which is
commit 898c57f4 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ic492873afc380526d2eca3276ec94c6c61156d30
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>