Add parsing of Xiaomi devices

[vbatoufflet]

This PR makes it that the device parsing for Xiaomi devices stop returning:

Family: "Generic Smartphone"
Brand:  "Generic"
Model:  "Smartphone"

but instead:

Family: "Xiaomi 23053RN02A"
Brand:  "Xiaomi"
Model:  "23053RN02A"

Note: it was originally requested towards the wrong repository ua-parser/uap-go#98