ipa: declare more already public functions

ipaccess_idtag_parse(), int ipaccess_send_id_req() and
paccess_parse_unitid().

In the mid to long term, the entire IPA/CCM handling should be
moved out of the processes and into a proper state machine inside
libosmocore or libosmoabis.
diff --git a/include/osmocom/abis/ipa.h b/include/osmocom/abis/ipa.h
index 648f105..7030830 100644
--- a/include/osmocom/abis/ipa.h
+++ b/include/osmocom/abis/ipa.h
@@ -92,4 +92,8 @@
 
 void ipa_msg_push_header(struct msgb *msg, uint8_t proto);
 
+int ipaccess_idtag_parse(struct tlv_parsed *dec, unsigned char *buf, int len);
+int ipaccess_send_id_req(int fd);
+int ipaccess_parse_unitid(const char *str, struct ipaccess_unit *unit_data);
+
 #endif