MAINTAINERS: mark CAIF as orphan

The listed address for the CAIF maintainer bounces with
"553 5.3.0 <dmitry.tarnyagin@lockless.no>... No such user here", and the
only existing email address of the maintainer in git history hasn't
responded in a week.
Therefore, remove the listed maintainer and mark CAIF as orphan.

Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -3390,9 +3390,8 @@ F:	Documentation/media/v4l-drivers/cafe_ccic*
 F:	drivers/media/platform/marvell-ccic/
 
 CAIF NETWORK LAYER
-M:	Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
 L:	netdev@vger.kernel.org
-S:	Supported
+S:	Orphan
 F:	Documentation/networking/caif/
 F:	drivers/net/caif/
 F:	include/uapi/linux/caif/