MAINTAINERS: Remove Conor Culhane from Silvaco I3C

Conor Culhane's email address (conor.culhane@silvaco.com) is no longer
accessible, and there has been no activity from him on
https://lore.kernel.org/linux-i3c/ in the past two years.

To avoid email delivery failure messages when sending patches to the I3C
mailing list, remove him from the Maintainers section and move him to the
credits.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20250204161151.2179596-1-Frank.Li@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: nxpfrankli

CREDITS

@@ -855,6 +855,10 @@ N: John Crispin
 E: john@phrozen.org
 D: MediaTek MT7623 Gigabit ethernet support
 
+N: Conor Culhane
+E: conor.culhane@silvaco.com
+D: Silvaco I3C master driver
+
 N: Laurence Culhane
 E: loz@holmes.demon.co.uk
 D: Wrote the initial alpha SLIP code

MAINTAINERS

@@ -21662,7 +21662,6 @@ F:	drivers/video/fbdev/sm712*
 
 SILVACO I3C DUAL-ROLE MASTER
 M:	Miquel Raynal <miquel.raynal@bootlin.com>
-M:	Conor Culhane <conor.culhane@silvaco.com>
 L:	linux-i3c@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml