dist/tools/openocd: make "reset run" command configurable

Co-Authored-By: jcarrano <juan@carrano.com.ar>

dist/tools/openocd/openocd.sh

@@ -90,6 +90,8 @@
 # the target when starting a debug session. 'reset halt' can also be used
 # depending on the type of target.
 : ${OPENOCD_DBG_START_CMD:=-c 'halt'}
+# command used to reset the board
+: ${OPENOCD_CMD_RESET_RUN:="-c 'reset run'"}
 # This is an optional offset to the base address that can be used to flash an
 # image in a different location than it is linked at. This feature can be useful
 # when flashing images for firmware swapping/remapping boot loaders.
@@ -323,7 +325,7 @@ do_reset() {
             -c 'telnet_port 0' \
             -c 'gdb_port 0' \
             -c 'init' \
-            -c 'reset run' \
+            ${OPENOCD_CMD_RESET_RUN} \
             -c 'shutdown'"
 }