musb 0.0.2

Mentor USB Support
# Now in:


https://github.com/py32-rs/py32-hal/pull/19





### musb IP:


| Vendor            |            | Chips (not fully listed)         | IP          |
| ----------------- | ---------- | -------------------------------- | ----------- |
| Texas Instruments | 德州仪器       | am335x,am1802, F2837xD, LM3S6911 | musb**      |
| allwinner         | 全志         | F1C100S, F133                    | musb phy ip |
| SiFli             | 思澈         | SF32LB52x                        | musb std*   |
| beken             | 北科微 or 小博通 | beken725x                        | musb std*   |
| essemi            | 东软载波微      | ES32F027x                        | musb std*   |
| STC               | 姚永平        | stc8, stc32, ai8051u             | musb mini*  |
| Puya              | 普冉         | py32f071, py32f403               | musb mini*  |

*: Not sure about the IP name

**: Further identification is needed