DM log userspace: Allow DM_ULOG_CTR exchange to accept devices for register
The following two patches allow the dm-log-userspace module to have a
two-way communication when DM_ULOG_CTR is issued. The outbound (kernel
-> userspace) msg sends the CTR information necessary to build the log
device. The new inbound (userspace -> kernel) msg sends the log device
name to the kernel so the kernel can call 'dm_get_device' on it. This
allows the necessary device dependencies to be built.
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