MAINTAINERS: remove myself as maintainer of SMC

I changed responsibilities some time ago, its time
to remove myself as maintainer of the SMC component.

Signed-off-by: Karsten Graul <[email protected]>
Signed-off-by: Wenjia Zhang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: karstengr

MAINTAINERS

@@ -19638,7 +19638,6 @@ S:	Maintained
 F:	drivers/misc/sgi-xp/
 
 SHARED MEMORY COMMUNICATIONS (SMC) SOCKETS
-M:	Karsten Graul <[email protected]>
 M:	Wenjia Zhang <[email protected]>
 M:	Jan Karcher <[email protected]>
 R:	D. Wythe <[email protected]>