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/Kconfig b/drivers/pinctrl/nxp/Kconfig
index 35640f0..238f77d 100644
--- a/drivers/pinctrl/nxp/Kconfig
+++ b/drivers/pinctrl/nxp/Kconfig
@@ -1,6 +1,20 @@
 config PINCTRL_IMX
 	bool
 
+config PINCTRL_IMX5
+	bool "IMX5 pinctrl driver"
+	depends on ARCH_MX5 && PINCTRL_FULL
+	select DEVRES
+	select PINCTRL_IMX
+	help
+	  Say Y here to enable the imx5 pinctrl driver
+
+	  This provides a simple pinctrl driver for i.MX 53SoC familiy,
+	  i.MX53. This feature depends on device tree
+	  configuration. This driver is different from the linux one,
+	  this is a simple implementation, only parses the 'fsl,pins'
+	  property and configure related registers.
+
 config PINCTRL_IMX6
 	bool "IMX6 pinctrl driver"
 	depends on ARCH_MX6 && PINCTRL_FULL