board: arc: accommodate upstream OpenOCD for ARC

In newer OpenOCD version from Zephyr's SDK v0.12, there are some
changes in OpenOCD scripts: JTAG probe interface (AKA "adapter")
setup, see http://openocd.zylin.com/#/c/5784/



And so we need to change OpenOCD scripts accordingly to match
newer OpenOCD version from Zephyr's SDK v0.12.

Signed-off-by: Watson Zeng <zhiwei@synopsys.com>