lnvm: introduce alias geometry for id-ns for lnvm

lnvm: introduce alias geometry for id-ns for lnvm

Now we have 2.0 OCSSD spec which introudces Geometry command instead of
Identity or something else.  This patch just adds an alias for this
command for the given NVMe namespace with backward compatibility.

Cc: Keith Busch <kbusch@kernel.org>
Cc: Matias Bjorling <mb@lightnvm.io>
Cc: Javier González <javier@javigon.com>
Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>