tbf: Move the struct to the tbf.h header file
This is the begin of a long march of turning tbf into a C++ class
and properly hiding the secrets inside this implementation instead
of having it spread across various different files.
diff --git a/src/gprs_rlcmac.cpp b/src/gprs_rlcmac.cpp
index 6546f8a..3dab44f 100644
--- a/src/gprs_rlcmac.cpp
+++ b/src/gprs_rlcmac.cpp
@@ -22,6 +22,7 @@
#include <gprs_bssgp_pcu.h>
#include <pcu_l1_if.h>
#include <gprs_rlcmac.h>
+#include <tbf.h>
/* 3GPP TS 05.02 Annex B.1 */