Revert "[nrf fromlist] boards: nordic: thingy53: Add QSPI nrfutil config"

This reverts commit 988e2e7.

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

boards/nordic/thingy53/board.cmake

@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 if(CONFIG_BOARD_THINGY53_NRF5340_CPUAPP OR CONFIG_BOARD_THINGY53_NRF5340_CPUAPP_NS)
-  board_runner_args(nrfutil "--ext-mem-config-file=${BOARD_DIR}/thingy53_qspi_nrfutil_config.json")
   board_runner_args(jlink "--device=nrf5340_xxaa_app" "--speed=4000")
 elseif(CONFIG_BOARD_THINGY53_NRF5340_CPUNET)
   board_runner_args(jlink "--device=nrf5340_xxaa_net" "--speed=4000")