MAINTAINERS: Mark powerpc Cell as orphaned

Arnd is no longer actively maintaining Cell, mark it as orphan.

Also drop the dead developerworks link.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240726123322.1165562-1-mpe@ellerman.id.au

CREDITS

@@ -378,6 +378,9 @@ S: 1549 Hiironen Rd.
 S: Brimson, MN  55602
 S: USA
 
+N: Arnd Bergmann
+D: Maintainer of Cell Broadband Engine Architecture
+
 N: Hennus Bergman
 P: 1024/77D50909 76 99 FD 31 91 E1 96 1C  90 BB 22 80 62 F6 BD 63
 D: Author and maintainer of the QIC-02 tape driver

MAINTAINERS

@@ -5096,10 +5096,8 @@ F:	Documentation/devicetree/bindings/media/cec/cec-gpio.yaml
 F:	drivers/media/cec/platform/cec-gpio/
 
 CELL BROADBAND ENGINE ARCHITECTURE
-M:	Arnd Bergmann <arnd@arndb.de>
 L:	linuxppc-dev@lists.ozlabs.org
-S:	Supported
-W:	http://www.ibm.com/developerworks/power/cell/
+S:	Orphan
 F:	arch/powerpc/include/asm/cell*.h
 F:	arch/powerpc/include/asm/spu*.h
 F:	arch/powerpc/include/uapi/asm/spu*.h