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/Kconfig b/arch/arm/Kconfig
index f58f8fb..0fa1f46 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1637,6 +1637,7 @@
 source "board/ucRobotics/bubblegum_96/Kconfig"
 source "board/birdland/bav335x/Kconfig"
 source "board/toradex/colibri_pxa270/Kconfig"
+source "board/variscite/dart_6ul/Kconfig"
 source "board/vscom/baltos/Kconfig"
 source "board/woodburn/Kconfig"
 source "board/xilinx/Kconfig"