Fix typos in HCD rusb file

[abakosh]

Describe the PR
Host Library:
The unplugging process of the USB device might lead to an infinite loop. It is easy to run into this situation if unplugging occurs during the enumeration process. Also, it happens when unplugging while the host and the USB device are doing something.

The issue is really big. As the stack enters an infinite loop when this is happening.

Additional context
I am testing with the RA4M2 family, with no OS. I know this fix is not meant if you are hosting a hub device. However, if you are planning to host a single device, it increases the robustness of plugging/unplugging while busy issue.
This was tested with MSC devices, I can see the improvement.

@hathach I am not sure if this fix is contagious for other scenarios. Please let me know if I need to take care of something else.

Thank you.

[hathach]

unfortunately the "fix" is too hacky. The changes for hcd_rusb2 look good, maybe split this to an seperate PR so that it can be merged.

PS: I did encounter it when enabling highspeed with nxp chip. Will try to look at this soon when I have time.

[hathach]

look good, hw test failed is due to the new addition of new hardware. We have to specific jlink serial so that It connect to correct board. GIve me some time to fix this. Once done, this will be merged. Thank you