i2s_channel_reconfig_std_slot() function

- ESP_OK Set clock successfully - ESP_ERR_NO_MEM No memory for DMA buffer - ESP_ERR_INVALID_ARG NULL pointer, invalid configuration or not standard mode - ESP_ERR_INVALID_STATE This channel is not initialized or not stopped

Only allowed to be called when the channel state is READY, i.e., channel has been initialized, but not started this function won't change the state. `i2s_channel_disable` should be called before calling this function if I2S has started. The input channel handle has to be initialized to standard mode, i.e., `i2s_channel_init_std_mode` has been called before reconfiguring