x86: Add Advantech SOM-DB5800/SOM-6867 support

Add support for Advantech SOM-DB5800 with the SOM-6867 installed.
This is very similar to conga-qeval20-qa3-e3845 in that there is a
reference carrier board (SOM-DB5800) with a Baytrail based SoM (SOM-6867)
installed.

Currently supported:
 - 2x UART (From ITE EC on SOM-6867) routed to COM3/4 connectors on
   SOM-DB5800.
 - 4x USB 2.0 (EHCI)
 - Video
 - SATA
 - Ethernet
 - PCIe
 - Realtek ALC892 HD Audio
   Pad configuration for HDA_RSTB, HDA_SYNC, HDA_CLK, HDA_SDO
   HDA_SDI0 is set in DT to enable HD Audio codec.
   Pin defaults for codec pin complexs are not changed.

Not supported:
 - Winbond Super I/O (Must be disabled with jumpers on SOM-DB8500)
 - USB 3.0 (XHCI)
 - TPM

Signed-off-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/board/advantech/Kconfig b/board/advantech/Kconfig
new file mode 100644
index 0000000..a8d4969
--- /dev/null
+++ b/board/advantech/Kconfig
@@ -0,0 +1,28 @@
+if VENDOR_ADVANTECH
+
+choice
+	prompt "Mainboard model"
+	optional
+
+config TARGET_SOM_DB5800_SOM_6867
+	bool "Advantech SOM-DB5800 & SOM-6867"
+	help
+	  Advantech SOM-DB5800 COM Express development board with SOM-6867
+	  installed.
+
+	  SOM-6867 is a COM Express Type 6 Compact Module with either an Intel
+	  Atom E3845 or Celeron N2920 processor.
+
+	  SOM-DB5800 is a COM Express Development board with:
+	    10/100/1000 Ethernet
+	    PCIe slots
+	    4x USB ports
+	    HDMI/DisplayPort/DVI, LVDS, VGA
+	    SATA ports
+	    ALC892 HD Audio Codec
+
+endchoice
+
+source "board/advantech/som-db5800-som-6867/Kconfig"
+
+endif