HID: apple: Swap the Fn and Left Control keys on Apple keyboards

commit 346338ef00d35bf8338ded171f9abeb9b10b43df upstream.

This patch allows users to swap the Fn and left Control keys on all Apple
keyboards: internal (e.g. Macbooks) and external (both wired and wireless).
The patch adds a new hid-apple module param: swap_fn_leftctrl (off by default).

Signed-off-by: Zakhar Semenov <mail@free5lot.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Cc: Aseda Aboagye <aaboagye@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>