KS869x: add new target
This patch adds Micrel's KS869x target. The configuration was taken from
http://www.mmnt.net/db/0/0/www.micrel.com/ethernet/8695 - Micrel's
FTP server i.e. their OpenOCD 7.0 package.
The only changes compared to the original file are the removal of
reset configuration, as it belongs to the board configuration and
the removal of adapter clock configuration.
Signed-off-by: Yegor Yefremov <firstname.lastname@example.org>