The use of these constants was removed during merging, probably because
the patches adding those defines and the dts patches were merged through
different trees.

Re-add them to make it clear which clocks are getting used.
Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220603094710.64591-2-luca.weiss@fairphone.com