arm64: dts: qcom: sc7280: correct sleep clock frequency

The SC7280 platform uses PMK8350 to provide sleep clock. According to the
documentation, that clock has 32.7645 kHz frequency. Correct the sleep
clock definition.

Fixes: 7a1f4e7f ("arm64: dts: qcom: sc7280: Add basic dts/dtsi files for sc7280 soc")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20241224-fix-board-clocks-v3-8-e9b08fbeadd3@linaro.org


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