output/sles: support floating point samples
According to https://developer.android.com/ndk/guides/audio/opensl/android-extensions This feature was mentioned in https://github.com/MusicPlayerDaemon/MPD/issues/922
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According to https://developer.android.com/ndk/guides/audio/opensl/android-extensions This feature was mentioned in https://github.com/MusicPlayerDaemon/MPD/issues/922