MAINTAINERS: Add Renesas SoC DT bindings doc to Renesas ARM sections

Suggested-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

MAINTAINERS

@@ -1756,6 +1756,7 @@ Q:	http://patchwork.kernel.org/project/linux-renesas-soc/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git next
 S:	Supported
 F:	arch/arm64/boot/dts/renesas/
+F:	Documentation/devicetree/bindings/arm/shmobile.txt
 F:	drivers/soc/renesas/
 F:	include/linux/soc/renesas/
 
@@ -1875,6 +1876,7 @@ F:	arch/arm/boot/dts/sh*
 F:	arch/arm/configs/shmobile_defconfig
 F:	arch/arm/include/debug/renesas-scif.S
 F:	arch/arm/mach-shmobile/
+F:	Documentation/devicetree/bindings/arm/shmobile.txt
 F:	drivers/soc/renesas/
 F:	include/linux/soc/renesas/