tests: use simulators in integration platforms

Where applicable, pick a simulator as the integration platform.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

tests/subsys/dfu/img_util/testcase.yaml

@@ -4,7 +4,7 @@ common:
     - native_sim
     - native_sim/native/64
   integration_platforms:
-    - nrf52840dk/nrf52840
+    - native_sim
 tests:
   dfu.image_util:
     tags: dfu_image_util

tests/subsys/dfu/mcuboot/testcase.yaml

@@ -6,4 +6,4 @@ tests:
       - native_sim/native/64
     tags: dfu_mcuboot
     integration_platforms:
-      - nrf52840dk/nrf52840
+      - native_sim

tests/subsys/dfu/mcuboot_multi/testcase.yaml

@@ -6,4 +6,4 @@ tests:
       - native_sim/native/64
     tags: dfu_mcuboot
     integration_platforms:
-      - nrf52840dk/nrf52840
+      - native_sim

tests/subsys/fs/fcb/testcase.yaml

@@ -9,12 +9,16 @@ tests:
       - mr_canhubk3
     tags: flash_circural_buffer
     integration_platforms:
-      - nrf52840dk/nrf52840
+      - native_sim
   filesystem.fcb.no_erase:
     platform_allow:
       - nrf54l09pdk/nrf54l09/cpuapp
       - nrf54l15dk/nrf54l15/cpuapp
       - nrf54l20pdk/nrf54l20/cpuapp
+      - native_sim
+    integration_platforms:
+      - nrf54l09pdk/nrf54l09/cpuapp
+      - native_sim
   filesystem.fcb.native_sim.no_erase:
     extra_args: CONFIG_FLASH_SIMULATOR_EXPLICIT_ERASE=n
     platform_allow: native_sim
@@ -28,7 +32,7 @@ tests:
       - mr_canhubk3
     tags: flash_circural_buffer
     integration_platforms:
-      - nrf52840dk/nrf52840
+      - native_sim
     extra_args: CONFIG_FCB_ALLOW_FIXED_ENDMARKER=y
   filesystem.fcb.native_sim.fcb_0x00:
     extra_args: DTC_OVERLAY_FILE=boards/native_sim_ev_0x00.overlay

tests/subsys/fs/littlefs/testcase.yaml

@@ -9,7 +9,7 @@ common:
     - mimxrt1060_evk/mimxrt1062/qspi
     - mr_canhubk3
   integration_platforms:
-    - nrf52840dk/nrf52840
+    - native_sim
   modules:
     - littlefs
 tests:

tests/subsys/jwt/testcase.yaml

@@ -5,7 +5,7 @@ common:
   timeout: 120
   tags: jwt
   integration_platforms:
-    - frdm_k64f
+    - qemu_x86
   extra_configs:
     - CONFIG_TEST_RANDOM_GENERATOR=y
 tests: