zephyr/boards: nrf54l15pdk_nrf54l15_cpuapp config

Renamed the DK config file to proper name.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
diff --git a/boot/zephyr/boards/nrf54l15dk_nrf54l15_cpuapp.conf b/boot/zephyr/boards/nrf54l15pdk_nrf54l15_cpuapp.conf
similarity index 100%
rename from boot/zephyr/boards/nrf54l15dk_nrf54l15_cpuapp.conf
rename to boot/zephyr/boards/nrf54l15pdk_nrf54l15_cpuapp.conf