1. Make up sources and bugfix. 2. Add nu_gpio_pin_get. 3. Add PM operator in USB host driver. 4. Support NUC980 stage 1 and add nk-980iot board.
2. Fix spi/qspi/uspi TX/RX PDMA trigger issue. 3. Drain RX FIFO to remove remain FEF frames in FIFO. 4. Implement RT_DEVICE_CTRL_CLOSE in uart/uuart/scuart driver.