xen: add Xen pvUSB maintainer

Add myself as maintainer for the Xen pvUSB stuff.
Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20211123132048.5335-4-jgross@suse.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -20859,6 +20859,14 @@ F:	drivers/scsi/xen-scsifront.c
 F:	drivers/xen/xen-scsiback.c
 F:	include/xen/interface/io/vscsiif.h
 
+XEN PVUSB DRIVER
+M:	Juergen Gross <jgross@suse.com>
+L:	xen-devel@lists.xenproject.org (moderated for non-subscribers)
+L:	linux-usb@vger.kernel.org
+S:	Supported
+F:	divers/usb/host/xen*
+F:	include/xen/interface/io/usbif.h
+
 XEN SOUND FRONTEND DRIVER
 M:	Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
 L:	xen-devel@lists.xenproject.org (moderated for non-subscribers)