samples: sysbuild: with_mcuboot: nucleo_h7s3l8: Use ext_flash_app var…

…iant

Now that ext_flash_app variant is available, it should be used for
mcuboot related apps on this board.

Delete boards/nucleo_h7s3l8.overlay (and boards/stm32h7s78_dk.overlay)
which are not needed anymore.

Signed-off-by: Thomas Decker <[email protected]>

Author: TD-JBL

samples/sysbuild/with_mcuboot/boards/nucleo_h7s3l8.overlay

@@ -14,7 +14,7 @@ tests:
       - esp32s3_devkitm/esp32s3/procpu
       - esp32c3_devkitm
       - esp32c6_devkitc/esp32c6/hpcore
-      - nucleo_h7s3l8
+      - nucleo_h7s3l8/stm32h7s3xx/ext_flash_app
       - nucleo_u385rg_q
       - stm32h7s78_dk/stm32h7s7xx/ext_flash_app
       - stm32h573i_dk