tcl/board: Add config for the Amazon Kindle 2 and DX

tcl/board: Add config for the Amazon Kindle 2 and DX

Add a config to access the Amazon Kindle Model No. D00701 and D00801.
Both ebook readers are based on a Freescale i.MX31. A JTAG interface is
included in a 40 pin FFC connector marked "J9" on both variants.

Change-Id: I58bb1ded3d6706bc3798af488ca8bafb7dc45225
Signed-off-by: Alexander Kurz <akurz@blala.de>
Reviewed-on: http://openocd.zylin.com/3956
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>