debian/control: add missing libcsv dependency

Change-Id: Icd013d545ac5b380676b3b5bef4ea81f91b86eee
diff --git a/debian/control b/debian/control
index 8301a42..a9eaa98 100644
--- a/debian/control
+++ b/debian/control
@@ -8,6 +8,7 @@
                dh-systemd (>= 1.5),
                autotools-dev,
                pkg-config,
+               libcsv-dev,
                libosmocore-dev,
                libosmo-abis-dev,
                libpcsclite-dev,