psa: Export internally psa_import_key_into_slot()

Export psa_import_key_into_slot from psa_crypto.c
to make it available to the driver wrapper.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 4cdfd99..5463a5f 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -583,33 +583,7 @@
     return( PSA_SUCCESS );
 }
 
-/** Import a key in binary format.
- *
- * \note The signature of this function is that of a PSA driver
- *       import_key entry point. This function behaves as an import_key
- *       entry point as defined in the PSA driver interface specification for
- *       transparent drivers.
- *
- * \param[in]  attributes       The attributes for the key to import.
- * \param[in]  data             The buffer containing the key data in import
- *                              format.
- * \param[in]  data_length      Size of the \p data buffer in bytes.
- * \param[out] key_buffer       The buffer containing the key data in output
- *                              format.
- * \param[in]  key_buffer_size  Size of the \p key_buffer buffer in bytes. This
- *                              size is greater or equal to \p data_length.
- * \param[out] key_buffer_length  The length of the data written in \p
- *                                key_buffer in bytes.
- * \param[out] bits             The key size in number of bits.
- *
- * \retval #PSA_SUCCESS  The key was imported successfully.
- * \retval #PSA_ERROR_INVALID_ARGUMENT
- *         The key data is not correctly formatted.
- * \retval #PSA_ERROR_NOT_SUPPORTED
- * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
- * \retval #PSA_ERROR_CORRUPTION_DETECTED
- */
-static psa_status_t psa_import_key_into_slot(
+psa_status_t psa_import_key_into_slot(
     const psa_key_attributes_t *attributes,
     const uint8_t *data, size_t data_length,
     uint8_t *key_buffer, size_t key_buffer_size,