* Serial2 changes: * stm32 driver moved to common dir. * earlier start of driver (Taranis) * wait for free buffer time limited USB changes: * Upgrade to ST USB-Host-Device_Lib_V2.2.0 (from V2.1.0) - this fixed a problem with USB serial #4086) * other fixes for #4086 * USB-Host-Device_Lib: renamed directory to V2.2.0 (from V2.1.0)