tests: boot: test_mcuboot: add stm32h750b_dk to CI platforms

Add stm32h750b_dk/stm32h750xx/ext_flash_app target to CI platforms.

Signed-off-by: Abderrahmane JARMOUNI <[email protected]>

Author: JarmouniA

tests/boot/test_mcuboot/testcase.yaml

@@ -54,12 +54,14 @@ tests:
       - esp32c3_devkitm
       - esp32c6_devkitc/esp32c6/hpcore
       - esp8684_devkitm
+      - stm32h750b_dk/stm32h750xx/ext_flash_app
     integration_platforms:
       - frdm_k64f
       - nrf52840dk/nrf52840
   bootloader.mcuboot.assert:
     platform_allow:
       - b_u585i_iot02a
+      - stm32h750b_dk/stm32h750xx/ext_flash_app
     extra_configs:
       - CONFIG_ASSERT=y
   bootloader.mcuboot.swap_using_move:
@@ -68,6 +70,7 @@ tests:
       - nrf5340dk/nrf5340/cpuapp
       - nrf52840dk/nrf52840
       - nucleo_wba55cg
+      - stm32h750b_dk/stm32h750xx/ext_flash_app
     integration_platforms:
       - frdm_k64f
       - nrf5340dk/nrf5340/cpuapp