arm: imx: add i.MX53 Beckhoff CX9020 Embedded PC

Add CX9020 board based on mx53loco.
Add simplified imx53 base device tree from kernel v4.8-rc8, to reuse
serial_mxc with DTE and prepare for device tree migration of other
functions and imx53 devices.

The CX9020 differs from i.MX53 Quick Start Board by:
- use uart2 instead of uart1
- DVI-D connector instead of VGA
- no audio
- CCAT FPGA connected to emi
- enable rtc

Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
diff --git a/configs/mx53cx9020_defconfig b/configs/mx53cx9020_defconfig
new file mode 100644
index 0000000..6954cf5
--- /dev/null
+++ b/configs/mx53cx9020_defconfig
@@ -0,0 +1,35 @@
+CONFIG_ARM=y
+CONFIG_ARCH_MX5=y
+CONFIG_TARGET_MX53CX9020=y
+CONFIG_DEFAULT_DEVICE_TREE="imx53-cx9020"
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/beckhoff/mx53cx9020/imximage.cfg"
+CONFIG_BOOTDELAY=1
+CONFIG_HUSH_PARSER=y
+# CONFIG_DM_MMC_OPS is not set
+CONFIG_CMD_BOOTZ=y
+# CONFIG_CMD_IMLS is not set
+CONFIG_CMD_MMC=y
+#CONFIG_CMD_USB=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_VIDEO=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_EXT2=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_NETDEVICES=y
+CONFIG_FEC_MXC=y
+CONFIG_MXC_UART=y
+CONFIG_OF_CONTROL=y
+CONFIG_FPGA_ALTERA=y
+CONFIG_FPGA_CYCLON2=y
+CONFIG_CMD_FPGA=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX5=y
+# CONFIG_VIDEO_SW_CURSOR is not set
+CONFIG_CFB_CONSOLE=y
+CONFIG_VGA_AS_SINGLE_DEVICE=y
+CONFIG_SYS_CONSOLE_BG_COL=0x00
+CONFIG_SYS_CONSOLE_FG_COL=0xa0