Revert "[nrf fromlist] secure_storage: Forbid usage with NRF_IRONSIDE"

This reverts commit 3282d05.

Author: Vge0rge

subsys/secure_storage/Kconfig

@@ -4,7 +4,6 @@
 menuconfig SECURE_STORAGE
 	bool "Secure storage subsystem"
 	depends on !BUILD_WITH_TFM
-	depends on !NRF_IRONSIDE
 	select MBEDTLS_PSA_CRYPTO_STORAGE_C if MBEDTLS_PSA_CRYPTO_C
 	select EXPERIMENTAL
 	help