samples: smp_svr: fix ext_flash configs

Disable FPROTECT for MCUBoot external flash builds due to
NVM size.

Signed-off-by: Mateusz Michalek <[email protected]>

Author: michalek-no

samples/subsys/mgmt/mcumgr/smp_svr/sample.yaml

@@ -181,6 +181,7 @@ tests:
       - mcuboot_EXTRA_DTC_OVERLAY_FILE="boards/nrf54l15dk_nrf54l15_cpuapp_ext_flash.overlay"
       - SB_CONFIG_PM_OVERRIDE_EXTERNAL_DRIVER_CHECK=y
       - SB_CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY=y
+      - mcuboot_CONFIG_FPROTECT=n
     platform_allow:
       - nrf54l15dk/nrf54l15/cpuapp
       - nrf54l15dk/nrf54l10/cpuapp
@@ -194,6 +195,7 @@ tests:
       - mcuboot_CONF_FILE="boards/nrf54l15dk_nrf54l15_cpuapp_ext_flash.conf"
       - mcuboot_EXTRA_DTC_OVERLAY_FILE="boards/nrf54l15dk_nrf54l15_cpuapp_ext_flash.overlay"
       - SB_CONFIG_PARTITION_MANAGER=n
+      - mcuboot_CONFIG_FPROTECT=n
     platform_allow:
       - nrf54l15dk/nrf54l15/cpuapp
       - nrf54l15dk/nrf54l10/cpuapp