boards: common: Enable debugging MAX32 with pico + OpenOCD

Explicitly set the OpenOCD target-handle so `west debug` will work
as expected on MAX32 targets using a supported OpenOCD version.

Signed-off-by: Pete Johanson <pete.johanson@analog.com>
(cherry picked from commit 0e8ea4d12a)

boards/common/openocd-adi-max32.boards.cmake

@@ -34,6 +34,7 @@ endif()
 
 board_runner_args(openocd --cmd-pre-init "source [find interface/${MAX32_INTERFACE_CFG}]")
 board_runner_args(openocd --cmd-pre-init "source [find target/${MAX32_TARGET_CFG}]")
+board_runner_args(openocd "--target-handle=_CHIPNAME.cpu")
 
 if(CONFIG_SOC_FAMILY_MAX32_M4)
   board_runner_args(openocd --cmd-pre-init "allow_low_pwr_dbg")