Convert @UsbDataStatus into bit field flags.

getUsbDataStatus now returns bit field values of @UsbDataStatus.

Also renaming from USB_DATA_STATUS_* to DATA_STATUS_* based on
review comments.

Bug: 216640242
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Change-Id: I96ade3dd7041a4094e57907069a872909a62e72f