1. Import M031 porting.
2. Support numaker-m032ki BSP.

(1) Support NK-N9H30 board.
(2) Change Mutex's flag to RT_IPC_FLAG_PRIO from RT_IPC_FLAG_FIFO.

1. Update module starting ordering.
2. Fix QSPI PDMA configuration.

1. Add NUC980 Chili board supporting.
2. Correct NuMicro.h including.
3. Implement rt_hw_us_delay system call function.
4. Move board.c to drv_common.c for M480 and M2354 series.

1. Add NuMaker-M2354 BSP.
2. Fix SLCD library and modify its demo.

1. NUC980 platform: USBH, INPUTCAPTURE, SPINAND.
2. Correct enter-quad-mode routine in board_dec.c.
3. Use RT_ASSERT to catch system-call-exceptions.

1. Add 980 drv_usbd.
2. EMAC - move MDC CLK divider before EMAC initialization.
3. Correct NUC980 and M480 CAN RX_MSG_ID_INDEX definition.
4. add USBD cdc demo - vcom_echo.
5. mnt - add mount_table definition.

1. Fix porting driver.
2. Add NAU8822 audio codec driver.
3. Add NUC980 I2S porting driver.

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.

Correct format and typo.

Fix rtt port issues.