HID: apple: Option to swap only left side mod keys

On the Keychron K8 keyboard, and probably others, the right side keys
should not be swapped to maintain PC layout.

Swapping the right side keys moves 'Super' before 'Alt gr' which is not
intended by the default Keychron layout or the ISO layout.

Signed-off-by: Lasse Brun <bruners@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>