MAINTAINERS: Adopt SanCloud dts files as supported

Myself and Marc are happy to maintain these device tree files going
forward.

Signed-off-by: Paul Barker <paul.barker@sancloud.com>
Acked-by: Marc Murphy <marc.murphy@sancloud.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

Author: pbrkr

MAINTAINERS

@@ -16439,6 +16439,12 @@ F:	drivers/phy/samsung/phy-s5pv210-usb2.c
 F:	drivers/phy/samsung/phy-samsung-usb2.c
 F:	drivers/phy/samsung/phy-samsung-usb2.h
 
+SANCLOUD BEAGLEBONE ENHANCED DEVICE TREE
+M:	Paul Barker <paul.barker@sancloud.com>
+R:	Marc Murphy <marc.murphy@sancloud.com>
+S:	Supported
+F:	arch/arm/boot/dts/am335x-sancloud*
+
 SC1200 WDT DRIVER
 M:	Zwane Mwaikambo <zwanem@gmail.com>
 S:	Maintained