tpm2-util: Make sure structs/enums are named and add to forward.h

We have to name structs/enums to be able to forward declare them, so
let's do that and add the missing ones to forward.h.

src/basic/forward.h

@@ -244,6 +244,8 @@ typedef enum PagerFlags PagerFlags;
 typedef enum PatternCompileCase PatternCompileCase;
 typedef enum ResolveSupport ResolveSupport;
 typedef enum TPM2Flags TPM2Flags;
+typedef enum Tpm2Support Tpm2Support;
+typedef enum Tpm2UserspaceEventType Tpm2UserspaceEventType;
 typedef enum UnitFileFlags UnitFileFlags;
 typedef enum UnitFilePresetMode UnitFilePresetMode;
 typedef enum UnitFileState UnitFileState;
@@ -269,6 +271,8 @@ typedef struct MountOptions MountOptions;
 typedef struct OpenFile OpenFile;
 typedef struct Pkcs11EncryptedKey Pkcs11EncryptedKey;
 typedef struct Table Table;
+typedef struct Tpm2Context Tpm2Context;
+typedef struct Tpm2Handle Tpm2Handle;
 typedef struct Tpm2PCRValue Tpm2PCRValue;
 typedef struct UnitInfo UnitInfo;
 typedef struct UserRecord UserRecord;