MAINTAINERS: Update DTS path for ARM/Microchip (AT91) SoC

Update the path to the supported DTS files for ARM/Microchip (AT91)
SoC to ensure that the output of the get_maintainer.pl script includes
the email addresses of the maintainers for all files located in
arch/arm/boot/dts/microchip.

Suggested-by: Conor Dooley <conor@kernel.org>
Signed-off-by: Andrei Simion <andrei.simion@microchip.com>
Reviewed-by: Cristian Birsan <cristian.birsan@microchip.com>
Link: https://lore.kernel.org/r/20240731144100.182221-1-andrei.simion@microchip.com
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

Author: Andrei Simion

MAINTAINERS

@@ -2535,8 +2535,7 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Supported
 W:	http://www.linux4sam.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/at91/linux.git
-F:	arch/arm/boot/dts/microchip/at91*
-F:	arch/arm/boot/dts/microchip/sama*
+F:	arch/arm/boot/dts/microchip/
 F:	arch/arm/include/debug/at91.S
 F:	arch/arm/mach-at91/
 F:	drivers/memory/atmel*