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.

Fix rtt port issues.