use osmo_rat_type from libosmocore

Replace locally defined enum ran_type with libosmocore's new enum
osmo_rat_type, and value_string ran_type_names with osmo_rat_type_names.

The string representations change, which has cosmetic effects on the test suite
expectations.

Depends: I659687aef7a4d67ca372a39fef31dee07aed7631 (libosmocore)
Change-Id: I2c78c265dc99df581e1b00e563d6912c7ffdb36b
diff --git a/include/osmocom/msc/vlr.h b/include/osmocom/msc/vlr.h
index 3c778a9..029ef31 100644
--- a/include/osmocom/msc/vlr.h
+++ b/include/osmocom/msc/vlr.h
@@ -178,7 +178,7 @@
 		/* list of struct subscr_request */
 		struct llist_head requests;
 		uint8_t lac;
-		enum ran_type attached_via_ran;
+		enum osmo_rat_type attached_via_ran;
 	} cs;
 
 	struct gsm_classmark classmark;