ARM: davinci: da850: generate dtbs for da850 boards

This helps generating device tree blobs for DaVinci DA850 boards with
command:

    'make ARCH=arm dtbs'.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/mach-davinci/Makefile.boot

@@ -11,3 +11,5 @@ else
 params_phys-y	:= 0x80000100
 initrd_phys-y	:= 0x80800000
 endif
+
+dtb-$(CONFIG_MACH_DA8XX_DT)	+= da850-enbw-cmc.dtb da850-evm.dtb