dt-bindings: clock: sparx5: Add bindings include file

The Sparx5 support 9 different clock outputs. This include file has
defines for each supported clock ordinal.

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200727084211.6632-8-lars.povlsen@microchip.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>