sdhci: Use bus_topo_lock and taskqueue_bus for hotplug events
Drop SDHCI_LOCK and instead acquire bus_topo_lock when adding and
removing new-bus devices.
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D49271
sdhci: Use bus_topo_lock and taskqueue_bus for hotplug events Tags None Referenced Files None Subscribers None
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