tests: fix: limit platforms in boot.with_mcumgr.test_upgrade_ble

Missed in zephyrproject-rtos#91596 that more platforms are added in common part.
Excluded nrf9160dk/nrf9160 and nucleo_wba55cg from
configuration with BLE.

Signed-off-by: Grzegorz Chwierut <grzegorz.chwierut@nordicsemi.no>

Author: gchwier

tests/boot/with_mcumgr/testcase.yaml

@@ -25,6 +25,9 @@ tests:
   boot.with_mcumgr.test_upgrade_ble:
     platform_allow:
       - nrf52840dk/nrf52840
+    platform_exclude:
+      - nrf9160dk/nrf9160
+      - nucleo_wba55cg
     integration_platforms:
       - nrf52840dk/nrf52840
     extra_args: EXTRA_CONF_FILE="overlay-bt.conf"