Remove AUDIO_CHANNEL_IN_7POINT1

This is not supported in Audio Hal V7

Supported:
AudioChannelMask AUDIO_CHANNEL_IN_2POINT0POINT2;
AudioChannelMask AUDIO_CHANNEL_IN_2POINT1POINT2;
AudioChannelMask AUDIO_CHANNEL_IN_3POINT0POINT2;
AudioChannelMask AUDIO_CHANNEL_IN_3POINT1POINT2;
AudioChannelMask AUDIO_CHANNEL_IN_5POINT1;
AudioChannelMask AUDIO_CHANNEL_IN_6;
AudioChannelMask AUDIO_CHANNEL_IN_FRONT_BACK;
AudioChannelMask AUDIO_CHANNEL_IN_MONO;
AudioChannelMask AUDIO_CHANNEL_IN_STEREO;