secure_storage: remove experimental status

The subsystem has been out for a year.
It has been taken into use by various parties and has gone through
additional downstream testing.
It is considered stable and mature enough to not be experimental
anymore.

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

Author: tomi-font

doc/releases/release-notes-4.3.rst

@@ -291,6 +291,10 @@ Libraries / Subsystems
     via :kconfig:option:`CONFIG_LOG_RATELIMIT_FALLBACK` to either log all messages or drop them completely.
     For more details, see :ref:`logging_ratelimited`.
 
+* Secure storage
+
+  * The experimental status has been removed. (:github:`96483`)
+
 Other notable changes
 *********************
 

subsys/secure_storage/Kconfig

@@ -5,7 +5,6 @@ menuconfig SECURE_STORAGE
 	bool "Secure storage subsystem"
 	depends on !BUILD_WITH_TFM
 	select MBEDTLS_PSA_CRYPTO_STORAGE_C if MBEDTLS_PSA_CRYPTO_C
-	select EXPERIMENTAL
 	help
 	  The secure storage subsystem provides an implementation of the PSA Secure Storage API
 	  functions on board targets that don't already have one.