FT32F4xx_DFP

1. Changed the selection, adding FT32F407RE.
2. Fixed existing bugs.
3. Updated SVD files.

1.Update the maximum clock setting's flash lantency to 9.
2.Fixed the issue of setting register bits in some ADC functions.

1. Fixed DMA channel priority configuration issue
2. Fixed FS Device data endpoint PID alternation issue
3. Fixed FS Device ZLP packet sending issue
4. Fixed FS Host EP0 endpoint packet splitting function
5. Recalibrated SVD files

First Release version of FT32F4 Device Family Pack.