tbf: Explicitly pass the direction to update_ms()

The type of the TBF update_ms() is being called on does not always
reflect whether the TLLI has been signaled by the MS or the SGSN.

This commit adds an additional parameter to tell the method, in which
direction the TLLI has been passed.

Sponsored-by: On-Waves ehf
diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index 2ec715b..081feef 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -65,7 +65,7 @@
 						0, 0, 0);
 	dl_tbf->update_tlli(0x2342);
 	dl_tbf->tlli_mark_valid();
-	dl_tbf->update_ms(0x2342);
+	dl_tbf->update_ms(0x2342, GPRS_RLCMAC_DL_TBF);
 	dl_tbf->ta = 4;
 	the_bts.timing_advance()->remember(0x2342, dl_tbf->ta);