MAINTAINERS: Move Vivien to CREDITS

Last patch from Vivien was nearly 3 years ago and he has not reviewed or
responded to DSA patches since then, move to CREDITS.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20221109231907.621678-1-f.fainelli@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

CREDITS

@@ -918,6 +918,11 @@ S: Ottawa, Ontario
 S: K1N 6Z9
 S: CANADA
 
+N: Vivien Didelot
+E: vivien.didelot@gmail.com
+D: DSA framework and MV88E6XXX driver
+S: Montreal, Quebec, Canada
+
 N: Jeff Dike
 E: jdike@karaya.com
 W: http://user-mode-linux.sourceforge.net

MAINTAINERS

@@ -12226,7 +12226,6 @@ F:	arch/mips/boot/dts/img/pistachio*
 
 MARVELL 88E6XXX ETHERNET SWITCH FABRIC DRIVER
 M:	Andrew Lunn <andrew@lunn.ch>
-M:	Vivien Didelot <vivien.didelot@gmail.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/dsa/marvell.txt
@@ -14324,7 +14323,6 @@ F:	drivers/net/wireless/
 
 NETWORKING [DSA]
 M:	Andrew Lunn <andrew@lunn.ch>
-M:	Vivien Didelot <vivien.didelot@gmail.com>
 M:	Florian Fainelli <f.fainelli@gmail.com>
 M:	Vladimir Oltean <olteanv@gmail.com>
 S:	Maintained