[core] Fix Ed25519 private key size

Author: TofMassilia13320

core/stse_generic_typedef.h

@@ -526,7 +526,7 @@ typedef enum stse_ac_change_right_t {
 #define STSE_ED25519_PUBLIC_KEY_SIZE    \
     STSE_ED25519_PUBLIC_KEY_LENGTH_SIZE \
     +STSE_ED25519_PUBLIC_KEY_VALUE_SIZE
-#define STSE_ED25519_PRIVATE_KEY_SIZE 64U
+#define STSE_ED25519_PRIVATE_KEY_SIZE 32U
 #define STSE_ED25519_EPHEMERAL_PUBLIC_KEY_SIZE \
     STSE_ED25519_ID_SIZE                       \
     +STSE_ED25519_PUBLIC_KEY_SIZE