ARM: dts: qcom: msm8660: fix node names for fixed clocks

Fix node names for three fixed clocks to follow the
no-underscores-in-name rule. To remain compatible with the drivers
expecting to find the old clock names, add clock-output-names
properties.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220909105136.3733919-6-dmitry.baryshkov@linaro.org