psa: Move from validate_key to import_key entry point

In the course of the development of the PSA unified
driver interface, the validate_key entry point for
opaque drivers has been removed and replaced by an
import_key entry point. This commit takes into account
this change of specification.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/psa_crypto_driver_wrappers.h b/library/psa_crypto_driver_wrappers.h
index 6b51437..4c6cce9 100644
--- a/library/psa_crypto_driver_wrappers.h
+++ b/library/psa_crypto_driver_wrappers.h
@@ -50,10 +50,11 @@
 psa_status_t psa_driver_wrapper_generate_key( const psa_key_attributes_t *attributes,
                                               psa_key_slot_t *slot );
 
-psa_status_t psa_driver_wrapper_validate_key( const psa_key_attributes_t *attributes,
-                                              const uint8_t *data,
-                                              size_t data_length,
-                                              size_t *bits );
+psa_status_t psa_driver_wrapper_import_key(
+    const psa_key_attributes_t *attributes,
+    const uint8_t *data, size_t data_length,
+    uint8_t *key_buffer, size_t key_buffer_size,
+    size_t *key_buffer_length, size_t *bits );
 
 psa_status_t psa_driver_wrapper_export_public_key( const psa_key_slot_t *slot,
                                                    uint8_t *data,