Floss: Match cod based on major and minor class

According to Spec: Assigned Numbers 2.8, we only need to compare major
and minor classes parts to know the device class. Putting higher bits
into consideration causes issues in some devices, for example, Bornd
C170B replies the device class as 0x2580, which makes it unable to be
recongnized as HID Pointing device.

Bug: 268730275
Test: pair with Bornd C170B
Change-Id: If8581c461da5af7c480aa9670b28ad0a6829470a