x86: Add theadorable-x86-dfi-bt700 board support

This patch adds support for the BayTrail based theadorable-x86-dfi-bt700
board which uses the DFI BT700 BayTrail Qseven SoM on a custom baseboard.
The main difference to the DFI baseboard is, that it isn't equipped
with a Super IO chip and uses the internal HS SIO UART (memory mapped
PCI based) as the console UART.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/dts/Makefile b/arch/x86/dts/Makefile
index ca086bd..3f534ad 100644
--- a/arch/x86/dts/Makefile
+++ b/arch/x86/dts/Makefile
@@ -15,6 +15,7 @@
 	minnowmax.dtb \
 	qemu-x86_i440fx.dtb \
 	qemu-x86_q35.dtb \
+	theadorable-x86-dfi-bt700.dtb \
 	broadwell_som-6896.dtb \
 	baytrail_som-db5800-som-6867.dtb