imx: imx6ul: Add support for Kontron Electronics SL/BL i.MX6UL/ULL boards (N63xx/N64xx)

This adds support for i.MX6UL/ULL-based evaluation kits with SoMs by
Kontron Electronics GmbH.

Currently there are the following SoM flavors (SoM-Line):
  * N6310: SOM with i.MX6UL-2, 256MB RAM, 256MB SPI NAND
  * N6311: SOM with i.MX6UL-2, 512MB RAM, 512MB SPI NAND
  * N6411: SOM with i.MX6ULL, 512MB RAM, 512MB SPI NAND

And the according evaluation boards (Board-Line):
  * N6310-S: Baseboard with SOM N6310, eMMC, display (optional), ...
  * N6311-S: Baseboard with SOM N6311, eMMC, display (optional), ...
  * N6411-S: Baseboard with SOM N6411, eMMC, display (optional), ...

Currently U-Boot describes i.MX6UL and i.MX6ULL through separate config
options at compile-time. Though the differences are so minor, that for
the scope of these SoMs we just use a single defconfig that is compatible
with both SoCs.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/mach-imx/mx6/Kconfig b/arch/arm/mach-imx/mx6/Kconfig
index ee73006..b4c8511 100644
--- a/arch/arm/mach-imx/mx6/Kconfig
+++ b/arch/arm/mach-imx/mx6/Kconfig
@@ -230,6 +230,15 @@
 	imply CMD_SATA
 	imply CMD_SPL
 
+config TARGET_KONTRON_MX6UL
+	bool "Kontron Electronics SL/BL i.MX6UL/ULL (N63xx/N64xx)"
+	depends on MX6UL
+	select BINMAN
+	select DM
+	select DM_THERMAL
+	select SUPPORT_SPL
+	imply CMD_DM
+
 config TARGET_KOSAGI_NOVENA
 	bool "Kosagi Novena"
 	select BOARD_LATE_INIT
@@ -668,6 +677,7 @@
 source "board/phytec/pcm058/Kconfig"
 source "board/phytec/pcl063/Kconfig"
 source "board/gateworks/gw_ventana/Kconfig"
+source "board/kontron/sl-mx6ul/Kconfig"
 source "board/kosagi/novena/Kconfig"
 source "board/softing/vining_2000/Kconfig"
 source "board/liebherr/display5/Kconfig"