USBD add core-power and Vbus handle#50

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alexrayne wants to merge 8 commits intoinsane-adding-machines:masterfrom

alexrayne:alexrayne-add-usbd-power

Commits on Feb 4, 2017

+common:regs:dwc - append some USB FS power and session control bits definition to DWC_OTG_GOTGINT, DWC_OTG_PCGCCTL
alexrayne
committed
+usbd:session callback - add this handle on session start/stop events. it intends to handle cable connetion, Vbus powering
alexrayne
committed

Commits on Feb 20, 2017

*usbd:session - fixed code style, linked disconnect and enablevia feature.USBD_USE_POWERDOWN
alexrayne
committed

Commits on May 28, 2017

!usbd:powedrown:disconnect -keep disconnection status during powerdown. therefore disconnection moved to background.
alexrayne
committed