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.

Add SPI NOR flash main storage configuration file.

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.