sun7i: Sync config with sun4i

In as far as possible, this enables a few drivers which should be safe to
use unmodified on the sun7i since they are identical.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
sunxi: Build sun4i-keyboard driver into the kernel

And only enable it when explictly enabled in the fex file.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>