psa: Remove MBEDTLS_PSA_CRYPTO_DRIVERS configuration option

The support for the PSA crypto driver interface
is not optional anymore as the implementation of
the PSA cryptography interface has been restructured
around the PSA crypto driver interface (see
psa-crypto-implementation-structure.md). There is
thus no purpose for the configuration options
MBEDTLS_PSA_CRYPTO_DRIVERS anymore.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 0ad6dcc..5e4c737 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -1229,18 +1229,6 @@
  */
 //#define MBEDTLS_PSA_CRYPTO_CLIENT
 
-/** \def MBEDTLS_PSA_CRYPTO_DRIVERS
- *
- * Enable support for the experimental PSA crypto driver interface.
- *
- * Requires: MBEDTLS_PSA_CRYPTO_C
- *
- * \warning This interface is experimental. We intend to maintain backward
- *          compatibility with application code that relies on drivers,
- *          but the driver interfaces may change without notice.
- */
-//#define MBEDTLS_PSA_CRYPTO_DRIVERS
-
 /** \def MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG
  *
  * Make the PSA Crypto module use an external random generator provided
@@ -2981,8 +2969,8 @@
  * Enable dynamic secure element support in the Platform Security Architecture
  * cryptography API.
  *
- * \deprecated This feature is deprecated. Please switch to the driver
- *             interface enabled by #MBEDTLS_PSA_CRYPTO_DRIVERS.
+ * \deprecated This feature is deprecated. Please switch to the PSA driver
+ *             interface.
  *
  * Module:  library/psa_crypto_se.c
  *