rmt_new_rx_channel() function

- ESP_OK: Create RMT RX channel successfully - ESP_ERR_INVALID_ARG: Create RMT RX channel failed because of invalid argument - ESP_ERR_NO_MEM: Create RMT RX channel failed because out of memory - ESP_ERR_NOT_FOUND: Create RMT RX channel failed because all RMT channels are used up and no more free one - ESP_ERR_NOT_SUPPORTED: Create RMT RX channel failed because some feature is not supported by hardware, e.g. DMA feature is not supported by hardware - ESP_FAIL: Create RMT RX channel failed because of other error