imx6: add Bachmann OT1200 board

This patch adds support for the OT1200 series of devices.

Following components are used in u-boot:
+ ethernet
+ i2c
+ emmc
+ gpio

For more details see README.

Changes v1 > v2
  - make use of enable_cspi_clock(..)
  - fix usage of OUTPUT_40OHM define
  - added README

Changes v2 > v3
  - improve spelling in README
  - added own copy of mx6q_4x_mt41j128.cfg

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
diff --git a/configs/ot1200_defconfig b/configs/ot1200_defconfig
new file mode 100644
index 0000000..c516038
--- /dev/null
+++ b/configs/ot1200_defconfig
@@ -0,0 +1,3 @@
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/bachmann/ot1200/mx6q_4x_mt41j128.cfg,MX6Q"
+CONFIG_ARM=y
+CONFIG_TARGET_OT1200=y