imx: Add variscite DART-6UL Evaluation Kit

Port for the DART-6UL Evaluation Kit SBC. Based on the variscite
DART-6UL iMX6ULL SoM.

CPU:   Freescale i.MX6ULL rev1.1 900 MHz (running at 396 MHz)
CPU:   Commercial temperature grade (0C to 95C) at 43C
Reset cause: POR
Model: Variscite DART-6UL Evaluation Kit
Board: Variscite DART-6UL Evaluation Kit
DRAM:  512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
In:    serial@02020000
Out:   serial@02020000
Err:   serial@02020000
Net:   FEC0

Working:
 - Eth0
 - i2c
 - MMC/SD
 - eMMC
 - USB host
 - UART 1

Note: LCDIF porting needs DM_VIDEO
https://lists.denx.de/pipermail/u-boot/2019-April/365506.html

Signed-off-by: Parthiban Nallathambi <parthitce@gmail.com>
diff --git a/arch/arm/mach-imx/mx6/Kconfig b/arch/arm/mach-imx/mx6/Kconfig
index e782859..f513c4c 100644
--- a/arch/arm/mach-imx/mx6/Kconfig
+++ b/arch/arm/mach-imx/mx6/Kconfig
@@ -161,6 +161,18 @@
 	select DM_THERMAL
 	select MX6ULL
 
+config TARGET_DART_6UL
+	bool "Variscite imx6ULL dart(DART-SOM-6ULL)"
+	select MX6ULL
+	select DM
+	select DM_ETH
+	select DM_GPIO
+	select DM_I2C
+	select DM_MMC
+	select DM_SERIAL
+	select DM_THERMAL
+	select SUPPORT_SPL
+
 config TARGET_DHCOMIMX6
 	bool "dh_imx6"
 	select BOARD_EARLY_INIT_F