1) Signal event immediately after HUB UsbRootHubEnumeration event is installed
2) Move UsbHcReset and UsbHcSetState before mUsbRootHubApi.Init
3) Change USB_DEBUG and USB_ERROR to R9 DEBUG macro.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3680 6f19259b-4bc3-4df7-8a09-765794883524