[nrf noup] samples: smp_svr: configuration for nrf54l15

Configuration allows DFU with serial transport using
mcumgr and over BT using nRF Connect.

Signed-off-by: Mateusz Michalek <mateusz.michalek@nordicsemi.no>

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

@@ -12,9 +12,11 @@ tests:
       - nrf52840dk_nrf52840
       - pinnacle_100_dvk
       - mg100
+      - nrf54l15pdk_nrf54l15_cpuapp
     integration_platforms:
       - nrf52dk_nrf52832
       - nrf52840dk_nrf52840
+      - nrf54l15pdk_nrf54l15_cpuapp
   sample.mcumgr.smp_svr.udp:
     extra_args: OVERLAY_CONFIG="overlay-udp.conf"
     platform_allow: frdm_k64f