When Mbed Crypto is built with the MBEDTLS_PSA_CRYPTO_SPM option enabled, this header is included by all .c files in Mbed Crypto that use PSA Crypto function names. This avoids duplication of symbols between TF-M and Mbed Crypto
Internal Trusted Storage service filesystem abstraction APIs. The purpose of this abstraction is to have the ability to plug-in other filesystems or filesystem proxies (supplicant)