[fedora-arm] Default to -lpae kernel

[Peter Robinson]

> Another possibly dumb Cubietruck question:
>
> Can I configure yum and/or dnf to only install the 'kernel-lpae'
> variant?  Currently a 'dnf update' will update 'kernel-lpae',
> *install* the (unwanted) 'kernel' and it seems to be a matter of luck
> which one becomes the new default at next boot.

Not used dnf on my CT yet but yum just upgrades to the next -lpae
version without issues

Peter