arm64: dts: qcom: sm8250: use constants for audio clocks

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