Remove compilation option MBEDTLS_PSA_HAS_ITS_IO

MBEDTLS_PSA_HAS_ITS_IO is not really useful since it doesn't actually
enable anything except the entropy seed file support, which only
requires the ITS interface and not a native implemetation. Remove it.
diff --git a/configs/config-psa-crypto.h b/configs/config-psa-crypto.h
index 0b57d1c..7f7c0cf 100644
--- a/configs/config-psa-crypto.h
+++ b/configs/config-psa-crypto.h
@@ -1146,16 +1146,6 @@
  */
 //#define MBEDTLS_ENTROPY_NV_SEED
 
-/**
- * \def MBEDTLS_PSA_HAS_ITS_IO
- *
- * Enable the non-volatile secure storage usage.
- *
- * This is crucial on systems that do not have a HW TRNG support.
- *
- */
-//#define MBEDTLS_PSA_HAS_ITS_IO
-
 /* MBEDTLS_PSA_CRYPTO_KEY_FILE_ID_ENCODES_OWNER
  *
  * In PSA key storage, encode the owner of the key.
@@ -1242,16 +1232,6 @@
 //#define MBEDTLS_PSA_CRYPTO_SPM
 
 /**
- * \def MBEDTLS_PSA_HAS_ITS_IO
- *
- * Enable the non-volatile secure storage usage.
- *
- * This is crucial on systems that do not have a HW TRNG support.
- *
- */
-//#define MBEDTLS_PSA_HAS_ITS_IO
-
-/**
  * \def MBEDTLS_RSA_NO_CRT
  *
  * Do not use the Chinese Remainder Theorem
@@ -2735,7 +2715,7 @@
  *
  * Requires: MBEDTLS_FS_IO
  */
-#define MBEDTLS_PSA_ITS_FILE_C
+//#define MBEDTLS_PSA_ITS_FILE_C
 
 /**
  * \def MBEDTLS_RIPEMD160_C