vlr: Use new libosmogsm struct osmo_gsup_pdp_info fields

This also makes sure it doesn't compile against older libosmogsm gsup
versions which would break ABI.

Related: OS#6091
Depends: libosmocore.git Change-Id 70be3560659c58f24b8db529c4fc85da4bb0ec04
Change-Id: Ia002fd6e0334d56de34d352a0bf1a8604e2e9fd3
diff --git a/TODO-RELEASE b/TODO-RELEASE
index d0852fc..8b07972 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,3 +7,4 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what		description / commit summary line
+libosmogsm  >1.9.0  ABI breakage in struct osmo_gsup_pdp_info, use new fields pdp_type_* and pdp_address.
\ No newline at end of file