Port of experimental Andrey Smirnov version of TMS570LS3137 flash support for actual OpenOCD 0.9+ version.

Basic TMS570 support works but there is issue with flashing.

The version known to work based on OpenOCD 0.8 can be found at

http://cmp.felk.cvut.cz/~pisa/tms570/openocd-tms570-f021-wip.tar.gz