Revert "xhci: Set HCD flag to defer primary roothub registration"

Revert "xhci: Set HCD flag to defer primary roothub registration"

This reverts commit b7a0a792f864583207c593b50fd1b752ed89f4c1.

It has been reported to be causing problems in Arch and Fedora bug
reports.

Reported-by: Hans de Goede <hdegoede@redhat.com>
Link: https://bbs.archlinux.org/viewtopic.php?pid=2000956#p2000956
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2019542
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2019576
Link: https://lore.kernel.org/r/42bcbea6-5eb8-16c7-336a-2cb72e71bc36@redhat.com
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Chris Chiu <chris.chiu@canonical.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>