MAINTAINERS: Add myself as the co-maintainer for Actions Semi platforms

Since I've been doing the maintainership work for couple of cycles, we've
decided to add myself as the co-maintainer along with Andreas.

Link: https://lore.kernel.org/r/[email protected]
Cc: "Andreas Färber" <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Acked-by: Andreas Färber <[email protected]>
Signed-off-by: Olof Johansson <[email protected]>

Author: Mani-Sadhasivam

MAINTAINERS

@@ -1405,7 +1405,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git
 
 ARM/ACTIONS SEMI ARCHITECTURE
 M:	Andreas Färber <[email protected]>
-R:	Manivannan Sadhasivam <[email protected]>
+M:	Manivannan Sadhasivam <[email protected]>
 L:	[email protected] (moderated for non-subscribers)
 S:	Maintained
 N:	owl