[nrf fromlist] tests: secure_storage: remove an integration platform

nrf54l15dk/nrf54l15/cpuapp already covers the non-emulated case as
part of the integration_platforms.
Having ophelia4ev/nrf54l15/cpuapp does not bring any additional value
and increases CI load, so remove it.

Signed-off-by: Tomi Fontanilles <[email protected]>

Upstream PR #: 94171

(cherry picked from commit f9e3cfe)

Author: tomi-font

tests/subsys/secure_storage/psa/crypto/testcase.yaml

@@ -8,7 +8,6 @@ tests:
     integration_platforms:
       - native_sim
       - nrf54l15dk/nrf54l15/cpuapp
-      - ophelia4ev/nrf54l15/cpuapp
   secure_storage.psa.crypto.tfm:
     filter: CONFIG_BUILD_WITH_TFM
     extra_args: EXTRA_CONF_FILE=overlay-tfm.conf

tests/subsys/secure_storage/psa/its/testcase.yaml

@@ -2,7 +2,6 @@ common:
   integration_platforms:
     - native_sim
     - nrf54l15dk/nrf54l15/cpuapp
-    - ophelia4ev/nrf54l15/cpuapp
   platform_exclude:
     - qemu_cortex_m0 # settings subsystem initialization fails
   timeout: 600