crimson/os/seastore/rbm: move mkfs to RBMDevice and use device_config_t

[myoungwon]

1. cleanups (bitmap layout)
2. move mkfs to RBMDevice
3. use device_config_t in rbm header

https://github.com/ceph/ceph/pull/47969#discussion_r994013349

Signed-off-by: Myoungwon Oh [email protected]

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[myoungwon]

@cyx1231st Can you take a look when you have time to review?

[myoungwon]

@cyx1231st Any other comments?