Move sgsn_pdp_ctx to its own file pdpctx.{c,h}
This further shrinks the mess in gprs_sgsn.h, and allows to easily see
layer violations (like pdpctx.c requiring llc.h)
Change-Id: Iad4da06efee7d8514ff48423bdaebc0f26413cc1
diff --git a/src/sgsn/sgsn_cdr.c b/src/sgsn/sgsn_cdr.c
index c22a6ac..db32644 100644
--- a/src/sgsn/sgsn_cdr.c
+++ b/src/sgsn/sgsn_cdr.c
@@ -28,6 +28,7 @@
#include <osmocom/sgsn/vty.h>
#include <osmocom/sgsn/gtp_ggsn.h>
+#include <osmocom/sgsn/pdpctx.h>
#include <gtp.h>
#include <pdp.h>