MTP Device: Parse USB3 descriptor for MTP initor;

MTP initor in Android only support MTP responder based on USB2.
Add support for MTP device based on USB3.

Change-Id: I52b7a5ddff8ae3f8c2ce8a802c2cb2865f4e162a
Signed-off-by: Bo Huang <bo.b.huang@intel.com>