MAINTAINERS: add "S: Maintained" to clkdev and clk sections

Russell King seems to be maintaining these.  Might as well mark them with
the appropriate S: entry

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -716,6 +716,7 @@ S:	Maintained
 ARM/CLKDEV SUPPORT
 M:	Russell King <linux@arm.linux.org.uk>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S:	Maintained
 F:	arch/arm/include/asm/clkdev.h
 F:	drivers/clk/clkdev.c
 
@@ -1842,6 +1843,7 @@ F:	include/linux/cleancache.h
 
 CLK API
 M:	Russell King <linux@arm.linux.org.uk>
+S:	Maintained
 F:	include/linux/clk.h
 
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