arm64: dts: qcom: sm6150: move standard clocks to SoC dtsi

Follow the example of all other platforms and reference standard clocks
(XO, sleep) from the SoC DT even if they are defined in the board DT
file.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250816-qcs615-move-clocks-v1-1-bc5665d6e1c3@oss.qualcomm.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>