Floss: Relax the condition to categorize HID devices by CoD

According to spec: Assigned Numbers, the bits 2-5 represent Minor Device
Class. We should use bits 6-7 only to determine the Major Device Class,
e.g. Pointing device, Keyboard, ...

Bug: 286600491
Test: test it locally
Change-Id: If3a7b1c73a011f5f1cd3c77c7126312f57b4ae40