Input: add input-event-codes header file

Add input-event-codes header file and move all type and axis defines
there.

The purpose of this new header file is to have a single canonical source
for event-codes which can be used outside of C-code too. One example of
such usage is the use of event-codes in devicetree source files.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

include/uapi/linux/Kbuild

@@ -191,6 +191,7 @@ header-y += inet_diag.h
 header-y += in.h
 header-y += inotify.h
 header-y += input.h
+header-y += input-event-codes.h
 header-y += in_route.h
 header-y += ioctl.h
 header-y += ip6_tunnel.h