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

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.

Link: https://lore.kernel.org/r/20200615133242.24911-8-lars.povlsen@microchip.com
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>