Rename psa_generate_random_key back to psa_generate_key

generate_key is a more classical name. The longer name was only
introduced to avoid confusion with getting a key from a generator,
which is key derivation, but we no longer use the generator
terminology so this reason no longer applies.

perl -i -pe 's/psa_generate_random_key/psa_generate_key/g' $(git ls-files)
diff --git a/include/psa/crypto_extra.h b/include/psa/crypto_extra.h
index a260964..d731c03 100644
--- a/include/psa/crypto_extra.h
+++ b/include/psa/crypto_extra.h
@@ -436,7 +436,7 @@
                                       size_t bits,
                                       psa_key_derivation_operation_t *operation);
 
-psa_status_t psa_generate_random_key_to_handle(psa_key_handle_t handle,
+psa_status_t psa_generate_key_to_handle(psa_key_handle_t handle,
                               psa_key_type_t type,
                               size_t bits,
                               const void *extra,