add all missing OSMO_GSUP_TO_MSGT_*() macros

OSMO_GSUP_TO_MSGT_RESULT() is needed by osmo-hlr for osmo_gsup_req.
The others are added for completeness' sake.

Related: I3a8dff3d4a1cbe10d6ab08257a0138d6b2a082d9
Change-Id: I6e38a3bb8447f8f212f8d6f5b10a5d0df59323d7

include/osmocom/gsm/gsup.h

@@ -203,7 +203,10 @@ enum osmo_gsup_message_type {
 
 #define OSMO_GSUP_IS_MSGT_REQUEST(msgt) (((msgt) & 0b00000011) == 0b00)
 #define OSMO_GSUP_IS_MSGT_ERROR(msgt)   (((msgt) & 0b00000011) == 0b01)
+#define OSMO_GSUP_IS_MSGT_RESULT(msgt)  (((msgt) & 0b00000011) == 0b10)
+#define OSMO_GSUP_TO_MSGT_REQUEST(msgt) (((msgt) & 0b11111100))
 #define OSMO_GSUP_TO_MSGT_ERROR(msgt)   (((msgt) & 0b11111100) | 0b01)
+#define OSMO_GSUP_TO_MSGT_RESULT(msgt)  (((msgt) & 0b11111100) | 0b10)
 
 extern const struct value_string osmo_gsup_message_type_names[];
 static inline const char *