MAINTAINERS: drop riscv list from cache controllers

When adding the bindings for cache controllers to the MAINTAINERS entry,
I forgot to drop the riscv mailing list - and so completely unrelated to
riscv stuff is now being sent there. Drop it.

Fixes: 4ca47d8 ("MAINTAINERS: add cache binding directory to cache driver entry")
Signed-off-by: Conor Dooley <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

Author: ConchuOD

MAINTAINERS

@@ -21293,7 +21293,6 @@ F:	drivers/staging/
 
 STANDALONE CACHE CONTROLLER DRIVERS
 M:	Conor Dooley <[email protected]>
-L:	[email protected]
 S:	Maintained
 T:	git https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/
 F:	Documentation/devicetree/bindings/cache/