Add flags for USB4 and Authorization

This change adds flags for USB4 and USB authorization. They're added together so that UsbService#registerKeyguardCallbacks is called when either flag is set since both features depend on this functionality.


Bug: 369430205
Bug: 409385933
Test: m
Flag: com.android.server.usb.flags.enable_usb4
Change-Id: Ie938f1de4f127f9bb4fe88298123683500858445