staging: fsl-mc: fix asymmetry in destroy of mc_io

An mc_io represents a mapped MC portal.  Previously, an mc_io was
created for the root dprc in fsl_mc_bus_probe() and for child dprcs
in dprc_probe().  But the free of that data structure happened in the
general bus remove callback.  This asymmetry resulted in some bugs due
to unwanted destroys of mc_io object in some scenarios (e.g. vfio).

Fix this bug by making things symmetric-- mc_io created in
fsl_mc_bus_probe() is freed in fsl_mc_bus_remove().  The mc_io created
in dprc_probe() is freed in dprc_remove().

Signed-off-by: Bharat Bhushan <[email protected]>
[Stuart: added check for root dprc and reworded commit message]
Signed-off-by: Stuart Yoder <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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