arm64: dts: qcom: qrb4210-rb2: correct sleep clock frequency

Qualcomm RB2 board uses PM6125 to provide sleep clock. According to the
documentation, that clock has 32.7645 kHz frequency. Correct the sleep
clock definition.

Fixes: 8d58a8c0 ("arm64: dts: qcom: Add base qrb4210-rb2 board dts")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20241224-fix-board-clocks-v3-6-e9b08fbeadd3@linaro.org


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