spapr: Remove unnecessary differences between hotplug and coldplug paths

spapr: Remove unnecessary differences between hotplug and coldplug paths

spapr_drc_attach() has a 'coldplug' parameter which sets the DRC into
configured state initially, instead of the usual ISOLATED/UNUSABLE state.
It turns out this is unnecessary: although coldplugged devices do need to
be in CONFIGURED state once the guest starts, that will already be
accomplished by the reset code which will move DRCs for already plugged
devices into a coldplug equivalent state.

Signed-off-by: David Gibson <[email protected]>
Reviewed-by: Laurent Vivier <[email protected]>
Reviewed-by: Greg Kurz <[email protected]>