Rename OSSL_ENCODER_CTX_new_by_EVP_PKEY and OSSL_DECODER_CTX_new_by_EVP_PKEY

Additional renames done in encoder and decoder implementation
to follow the style.

Fixes #13622

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14155)
diff --git a/test/evp_extra_test.c b/test/evp_extra_test.c
index b3f2ec6..2d32eb9 100644
--- a/test/evp_extra_test.c
+++ b/test/evp_extra_test.c
@@ -419,8 +419,8 @@
     const unsigned char **pdata = &data;
     EVP_PKEY *pkey = NULL;
     OSSL_DECODER_CTX *dctx =
-        OSSL_DECODER_CTX_new_by_EVP_PKEY(&pkey, "DER", NULL, keytype, 0,
-                                         testctx, NULL);
+        OSSL_DECODER_CTX_new_for_pkey(&pkey, "DER", NULL, keytype, 0,
+                                      testctx, NULL);
 
     /* |pkey| will be NULL on error */
     (void)OSSL_DECODER_from_data(dctx, pdata, &data_len);