Store as V1.0 reference by default

Store IUsb as V1.0 instance by default and downcast when
calling V1.2 methods.

Bug: 123498520
Test: Checked dumpsys usb to reflect port status for
V1.0, V1.2, V1.3 implementations.
Change-Id: Id55d930252bff39b3b86283f3b6ab33a5e935b24