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/drivers/pinctrl/nxp/Makefile b/drivers/pinctrl/nxp/Makefile
index 0ee7f2f..e0f7325 100644
--- a/drivers/pinctrl/nxp/Makefile
+++ b/drivers/pinctrl/nxp/Makefile
@@ -1,3 +1,4 @@
 obj-$(CONFIG_PINCTRL_IMX)		+= pinctrl-imx.o
+obj-$(CONFIG_PINCTRL_IMX5)		+= pinctrl-imx5.o
 obj-$(CONFIG_PINCTRL_IMX6)		+= pinctrl-imx6.o
 obj-$(CONFIG_PINCTRL_IMX7)		+= pinctrl-imx7.o