arm64: dts: qcom: sm8250: use the right clock-freqency for sleep-clk

Downstream has this clock as 32000 rate, but testing shows it is close to
32768.
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Link: https://lore.kernel.org/r/20200903215923.14314-1-jonathan@marek.caSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sm8250.dtsi

@@ -73,7 +73,7 @@ xo_board: xo-board {
 
 		sleep_clk: sleep-clk {
 			compatible = "fixed-clock";
-			clock-frequency = <32000>;
+			clock-frequency = <32768>;
 			#clock-cells = <0>;
 		};
 	};