USB: Notify OTG about unsupported device and hnp enable failure

OTG specification mandates an explicit message like "HUB device
not supported" to be displayed to user if host does not support
HUB class peripherals.  Distinguish HUB class peripheral from
other unsupported peripherals and send the corresponding event.

Change-Id: I2b5cfa0b19d2172b21c2a4036dd57bbf1356adef
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>