[nrf noup] boot: zephyr: Kconfig update nrf54l15dk symbol for ED25519

fixup! [nrf noup] PSA configuration required changes

Updates pdk to dk symbol.

Signed-off-by: Mateusz Michalek <[email protected]>
(cherry picked from commit e60dc3f)

Author: michalek-no

boot/zephyr/Kconfig

@@ -202,7 +202,7 @@ config BOOT_SIGNATURE_TYPE_PURE_ALLOW
 
 choice BOOT_SIGNATURE_TYPE
 	prompt "Signature type"
-	default BOOT_SIGNATURE_TYPE_ED25519 if BOARD_NRF54L15PDK_NRF54L15_CPUAPP
+	default BOOT_SIGNATURE_TYPE_ED25519 if SOC_NRF54L15_CPUAPP
 	default BOOT_SIGNATURE_TYPE_RSA
 
 config BOOT_SIGNATURE_TYPE_NONE