MAINTAINERS: add DT/bindings files to at91 entry

With this change the DT and binding files are under the at91 tree
maintainer, and get_maintainer.pl correctly reports the entry.

Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6f23422..ce38811 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -412,13 +412,21 @@
 M:	Eugen Hristev <eugen.hristev@microchip.com>
 S:	Maintained
 T:	git https://source.denx.de/u-boot/custodians/u-boot-at91.git
+F:	arch/arm/dts/at91*
+F:	arch/arm/dts/sam*
 F:	arch/arm/mach-at91/
 F:	board/atmel/
 F:	drivers/cpu/at91_cpu.c
 F:	drivers/memory/atmel-ebi.c
 F:	drivers/misc/microchip_flexcom.c
 F:	drivers/timer/atmel_tcb_timer.c
+F:	include/dt-bindings/clk/at91.h
+F:	include/dt-bindings/clock/at91.h
+F:	include/dt-bindings/dma/at91.h
+F:	include/dt-bindings/mfd/at91-usart.h
 F:	include/dt-bindings/mfd/atmel-flexcom.h
+F:	include/dt-bindings/pinctrl/at91.h
+F:	include/dt-bindings/sound/microchip,pdmc.h
 F:	drivers/timer/mchp-pit64b-timer.c
 
 ARM MSC SM2S IMX8MP SOM