mgr/cephadm: fix nvmeof reconfig loop by preserving daemon deps

mgr/cephadm: fix nvmeof reconfig loop by preserving daemon deps

nvmeof daemons entered a repeated reconfig/restart loop when auth/TLS was
enabled.

Generic ServiceSpec logic sets certificate_source to cephadm-signed when TLS
is enabled, so cephadm reconcile computes certificate-related deps for the
daemon. However, NvmeofService.prepare_create() reset daemon_spec.deps to an
empty list, causing _create_daemon() to persist [] back into cache.

On the next reconcile cycle, cephadm again observed current deps differing
from cached last_deps and reconfigured the daemon repeatedly.

Fix this by preserving the correct nvmeof daemon dependencies during
prepare_create() so reconcile can converge.

Signed-off-by: Kushal Deb <Kushal.Deb@ibm.com>