powerpc/40x: Remove 40x platforms.

40x platforms have been orphaned for many years.

Remove them.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240628121201.130802-1-mpe@ellerman.id.au

Author: chleroy

MAINTAINERS

@@ -12755,7 +12755,6 @@ F:	arch/powerpc/platforms/52xx/
 LINUX FOR POWERPC EMBEDDED PPC4XX
 L:	linuxppc-dev@lists.ozlabs.org
 S:	Orphan
-F:	arch/powerpc/platforms/40x/
 F:	arch/powerpc/platforms/44x/
 
 LINUX FOR POWERPC EMBEDDED PPC85XX