gprs_gmm: make extract_subscr_msisdn extract_subscr_hlr public

Change-Id: I54168e1a58dd36b38c53c13bbb5cdb4311f34410
diff --git a/src/gprs/gprs_gmm.c b/src/gprs/gprs_gmm.c
index df498c1..57d3883 100644
--- a/src/gprs/gprs_gmm.c
+++ b/src/gprs/gprs_gmm.c
@@ -848,7 +848,7 @@
 	return rc;
 }
 
-static void extract_subscr_msisdn(struct sgsn_mm_ctx *ctx)
+void extract_subscr_msisdn(struct sgsn_mm_ctx *ctx)
 {
 	struct gsm_mncc_number called;
 	uint8_t msisdn[sizeof(ctx->subscr->sgsn_data->msisdn) + 1];
@@ -879,7 +879,7 @@
 	}
 }
 
-static void extract_subscr_hlr(struct sgsn_mm_ctx *ctx)
+void extract_subscr_hlr(struct sgsn_mm_ctx *ctx)
 {
 	struct gsm_mncc_number called;
 	uint8_t hlr_number[sizeof(ctx->subscr->sgsn_data->hlr) + 1];