MAINTAINERS: Add git repository to Renesas clock driver section

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>

MAINTAINERS

@@ -11428,6 +11428,7 @@ F:	include/linux/rpmsg/
 RENESAS CLOCK DRIVERS
 M:	Geert Uytterhoeven <geert+renesas@glider.be>
 L:	linux-renesas-soc@vger.kernel.org
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git clk-renesas
 S:	Supported
 F:	drivers/clk/renesas/