SDP: store all ptmap entries

If a ptmap appears in the SDP, always store it in the ptmap array. No longer
attempt to drop entries if they match the conventional payload type number.

- One reason is that the past code only matched full explicit "FOO/8000/1"
  strings, while the channel number "/1" can be omitted to imply 1; by simply
  storing everything received in the SDP, there is no need to add complexity
  to match both "FOO/8000" and "FOO/8000/1".

- The other reason is to rather parse exactly what was received, instead of
  filtering entries, to take away a degree of implied magic.

Change-Id: I2a69c21e68c602daf804744212d335ab1eafd81b
1 file changed