Rename and move func checking if amr mode is explicitly configured

The previous naming was quite confusing, since the function is not
really checking whether a conversion is needed, but rather whether the
codec has the AMR RTP mode defined explicitly and hence forced.

The previous naming didn't harm because the amr_oa_bwe_convert also
supports the conversion path OA<->OA and BE<->BE.
Hence nowadays the amr_oa_bwe_convert() function is called always if the
dst conn has its codec with AMR RTP mode explicitly set, no matter if
the src and dst conn have the same mode.

Related: SYS#6161
Change-Id: I8dce3038ebccf5e1e37e2908070a67d66693a96f
diff --git a/include/osmocom/mgcp/mgcp_codec.h b/include/osmocom/mgcp/mgcp_codec.h
index 97e6b8d..994d770 100644
--- a/include/osmocom/mgcp/mgcp_codec.h
+++ b/include/osmocom/mgcp/mgcp_codec.h
@@ -17,4 +17,5 @@
 int mgcp_codec_pt_translate(struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst, int payload_type);
 const struct mgcp_rtp_codec *mgcp_codec_pt_find_by_subtype_name(struct mgcp_conn_rtp *conn,
 								const char *subtype_name, unsigned int match_nr);
+bool mgcp_codec_amr_align_mode_is_indicated(const struct mgcp_rtp_codec *codec);
 bool mgcp_codec_amr_is_octet_aligned(const struct mgcp_rtp_codec *codec);