samples/dfu/fw_loader/ble_mcumgr: remove PM reminds

The sample was already running on DTS
Partitioning.
Remove unused pm_static and force no-PM in
project Kconfig.sysbuild

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

Author: nvlsianpu

samples/dfu/fw_loader/ble_mcumgr/Kconfig.sysbuild

@@ -14,4 +14,7 @@ config NETCORE_IPC_RADIO_BT_HCI_IPC
 
 endif # SOC_SERIES_NRF54H
 
+config PARTITION_MANAGER
+	default n
+
 source "${ZEPHYR_BASE}/share/sysbuild/Kconfig"

samples/dfu/fw_loader/ble_mcumgr/pm_static_nrf54l15dk_nrf54l15_cpuapp.yml

@@ -16,5 +16,4 @@ tests:
       - nrf54h20dk/nrf54h20/cpuapp
       - nrf7120dk/nrf7120/cpuapp
     extra_args:
-      - SB_CONFIG_PARTITION_MANAGER=n
       - mcuboot_CONFIG_FPROTECT=n