gb: add bssgp2_enc_flush_ll encode FLUSH-LL

Change-Id: I76dc3b08a63cfd78c9f7657fb58c2ddfa9b4b7e2
diff --git a/src/gb/libosmogb.map b/src/gb/libosmogb.map
index ff5b34a..e02273d 100644
--- a/src/gb/libosmogb.map
+++ b/src/gb/libosmogb.map
@@ -85,6 +85,7 @@
 bssgp2_enc_fc_bvc_ack;
 bssgp2_enc_fc_ms;
 bssgp2_enc_fc_ms_ack;
+bssgp2_enc_flush_ll;
 bssgp2_enc_status;
 
 bssgp_bvc_fsm_alloc_sig_bss;