MAINTAINERS: Add file patterns for clock device tree bindings

Submitters of device tree binding documentation may forget to CC
the subsystem maintainer if this is missing.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: linux-clk@vger.kernel.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 7304d2e..2334995 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3086,6 +3086,7 @@
 L:	linux-clk@vger.kernel.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git
 S:	Maintained
+F:	Documentation/devicetree/bindings/clock/
 F:	drivers/clk/
 X:	drivers/clk/clkdev.c
 F:	include/linux/clk-pr*