Linux 5.16: use bdev_nr_bytes() to get device capacity

This helper was introduced long ago, in 5.16. Since 6.10, bd_inode no
longer exists, but the helper has been updated, so detect it and use it
in all versions where it is available.

Signed-off-by: Rob Norris <[email protected]>
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Tony Hutter <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>