MAINTAINERS: xen: Konrad to step down and Juergen to pick up

I've lately been concentrating on other projects and haven't been
doing much of Xen core maintainership for the last year.

I am quite thrilled that Juergen is willing to help out!

P.S.
I am still the maintainer of Xen-SWIOTLB, Xen PCI-[front|backend],
and co-maintainer of Xen block-[front|backend]; amongst others.

Acked-by: Juergen Gross <[email protected]>
Acked-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: David Vrabel <[email protected]>

Author: konradwilk

MAINTAINERS

@@ -12202,9 +12202,9 @@ S:	Maintained
 F:	drivers/media/tuners/tuner-xc2028.*
 
 XEN HYPERVISOR INTERFACE
-M:	Konrad Rzeszutek Wilk <[email protected]>
 M:	Boris Ostrovsky <[email protected]>
 M:	David Vrabel <[email protected]>
+M:	Juergen Gross <[email protected]>
 L:	[email protected] (moderated for non-subscribers)
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git
 S:	Supported