arm: dts: Use upstream dts

Make use of OF_UPSTREAM which uses Linux dts.

Signed-off-by: david regan <dregan@broadcom.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: Anand Gore <anand.gore@broadcom.com>
diff --git a/arch/arm/mach-bcmbca/bcm6878/Kconfig b/arch/arm/mach-bcmbca/bcm6878/Kconfig
index 43f8942..2365cfd 100644
--- a/arch/arm/mach-bcmbca/bcm6878/Kconfig
+++ b/arch/arm/mach-bcmbca/bcm6878/Kconfig
@@ -8,6 +8,7 @@
 config TARGET_BCM96878
 	bool "Broadcom 6878 Reference Board"
 	depends on ARCH_BCMBCA
+	imply OF_UPSTREAM
 
 config SYS_SOC
 	default "bcm6878"