Move UL allocation&assign functions to gprs_ms.c

Similar structure as what we have with DL-TBF.

Change-Id: I256aeede2a2678c9738539fb6ec4db9766fa85e4
diff --git a/src/gprs_ms.h b/src/gprs_ms.h
index 8014f26..53b0cd6 100644
--- a/src/gprs_ms.h
+++ b/src/gprs_ms.h
@@ -144,6 +144,8 @@
 bool ms_nacc_rts(const struct GprsMs *ms);
 struct msgb *ms_nacc_create_rlcmac_msg(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts);
 
+struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_assigned_pacch(struct GprsMs *ms, int8_t use_trx);
+struct gprs_rlcmac_ul_tbf *ms_new_ul_tbf_assigned_agch(struct GprsMs *ms);
 int ms_new_dl_tbf_assigned_on_pacch(struct GprsMs *ms, struct gprs_rlcmac_tbf *tbf);
 int ms_new_dl_tbf_assigned_on_pch(struct GprsMs *ms);
 int ms_append_llc_dl_data(struct GprsMs *ms, uint16_t pdu_delay_csec, const uint8_t *data, uint16_t len);