clk: qcom: drop lcc-mdm9615 in favour of lcc-msm8960

clk: qcom: drop lcc-mdm9615 in favour of lcc-msm8960

The two LCC drivers, msm8960 and mdm9615 are almost the same. The only
difference is the platform clock: msm8960/apq8064 use pxo, while mdm9615
uses cxo. Drop the lcc-mdm9615 in favour of using lcc-msm8960 instead.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230512211727.3445575-6-dmitry.baryshkov@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>