[nrf fromlist] samples: drivers: jesd216: add nrf54l15dk cases.

Extend jesd216 sample with nrf54l15dk cases. These platforms have
jesd216 compatible flash memories on board.

Upstream PR #: 97495

Signed-off-by: Bartlomiej Buczek <[email protected]>

Author: nordic-babu

samples/drivers/jesd216/sample.yaml

@@ -30,8 +30,11 @@ tests:
     platform_allow: nrf52840dk/nrf52840
     integration_platforms:
       - nrf52840dk/nrf52840
-  sample.drivers.jesd216.nrf54lm20:
+  sample.drivers.jesd216.nrf54l:
     platform_allow:
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l15dk/nrf54l10/cpuapp
+      - nrf54l15dk/nrf54l05/cpuapp
       - nrf54lm20dk/nrf54lm20a/cpuapp
     integration_platforms:
       - nrf54lm20dk/nrf54lm20a/cpuapp