backport of 8cb0cd68bef7 (dt-bindings: nvmem: sfp: Add clock properties)

Hi Greg,

This patch should have been picked for the 5.18 branch where the device tree binding was introcuded first, but instead it landed in -next without a Fixes: tag [1].

Now there is a backwards incompatible change between 5.18 and the upcoming 5.19. Thus, can this be picked up for the 5.18 tree?

More background can be found in [2].

-michael

[1] https://lore.kernel.org/r/3b8fc56f64508f7604f3b9e14b048568@walle.cc [2] https://lore.kernel.org/r/4a45db184fbadc278624571dfbeb5004@walle.cc