Add pkey types for curve448

Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NKurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/5481)

include/openssl/evp.h

@@ -59,6 +59,8 @@
 # define EVP_PKEY_SIPHASH NID_siphash
 # define EVP_PKEY_X25519 NID_X25519
 # define EVP_PKEY_ED25519 NID_ED25519
+# define EVP_PKEY_X448 NID_X448
+# define EVP_PKEY_ED448 NID_ED448
 
 #ifdef  __cplusplus
 extern "C" {