MAINTAINERS: add device-tree files to TI DaVinci entry

Add device-tree files relevant to TI DaVinci platform
to its entry so mach-davinci sub-arch maintainers get
copied on patches with device-tree file updates.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>

MAINTAINERS

@@ -11775,6 +11775,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci.git
 S:	Supported
 F:	arch/arm/mach-davinci/
 F:	drivers/i2c/busses/i2c-davinci.c
+F:	arch/arm/boot/dts/da850*
 
 TI DAVINCI SERIES MEDIA DRIVER
 M:	"Lad, Prabhakar" <prabhakar.csengg@gmail.com>