Add support for Aero 17 XE5

[mpolishchuck]

Hello.

Just wanted to add support for my laptop Aero 17 XE5.

Seems like everything what is implemented so for is working on this model too.

However, there are two things:

1. Fn+F12 generates different code. I've added new constant for it.
2. When Fn key is being pressed then keyboard generated Xf86TouchpadOff button event. I do no know if it happens on other models. If yes then this is out of scope. Otherwise this should be fixed here. Not sure what to do with this. (This is solved for Aero 17 XE5 explicitly, see my note in conversation about this PR)

[mpolishchuck]

Updated PR to solve point 2 from my note above. However I'm still not sure if it happens on other models, so it will work only for Aero 17 XE5.