gprs_gmm: make extract_subscr_msisdn extract_subscr_hlr public

Change-Id: I54168e1a58dd36b38c53c13bbb5cdb4311f34410
diff --git a/include/osmocom/sgsn/gprs_gmm.h b/include/osmocom/sgsn/gprs_gmm.h
index b89eff5..3c93efc 100644
--- a/include/osmocom/sgsn/gprs_gmm.h
+++ b/include/osmocom/sgsn/gprs_gmm.h
@@ -40,4 +40,7 @@
 				uint8_t gmm_cause);
 int gsm48_tx_gmm_att_ack(struct sgsn_mm_ctx *mm);
 
+/* TODO: move extract_subscr_* when gsm48_gmm_authorize() got removed */
+void extract_subscr_msisdn(struct sgsn_mm_ctx *ctx);
+void extract_subscr_hlr(struct sgsn_mm_ctx *ctx);
 #endif /* _GPRS_GMM_H */