remove codec-only info from README.Trimedia
remove codec-only info from README.Trimedia

maolin-cdzl/speexdsp,felipebetancur/speexdsp,felipebetancur/speexdsp,maolin-cdzl/speexdsp,felipebetancur/speexdsp,felipebetancur/speexdsp,maolin-cdzl/speexdsp,maolin-cdzl/speexdsp