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

This reverts commit 2d7c20db which is
commit b7a0a792f864583207c593b50fd1b752ed89f4c1 upstream.

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>