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 <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
