MAINTAINERS: Add patterns for DTS files for AT91

Help ensure updates to the DTS files for AT91 machines and devices get
sent to the maintainers by adding patterns to the MAINTAINERS entry for
the architecture.
Signed-off-by: NMark Brown <broonie@linaro.org>
[nicolas.ferre@atmel.com: add "sama*.dts/dtsi" strings to the list]
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

MAINTAINERS

@@ -763,6 +763,10 @@ W:	http://maxim.org.za/at91_26.html
 W:	http://www.linux4sam.org
 S:	Supported
 F:	arch/arm/mach-at91/
+F:	arch/arm/boot/dts/at91*.dts
+F:	arch/arm/boot/dts/at91*.dtsi
+F:	arch/arm/boot/dts/sama*.dts
+F:	arch/arm/boot/dts/sama*.dtsi
 
 ARM/CALXEDA HIGHBANK ARCHITECTURE
 M:	Rob Herring <rob.herring@calxeda.com>