ARM: dts: qcom: ipq4019: fix sleep clock

It seems like sleep_clk was copied from ipq806x.
Fix ipq40xx sleep_clk to the value QSDK defines.

Link: https://source.codeaurora.org/quic/qsdk/oss/kernel/linux-msm/commit/?id=d92ec59973484acc86dd24b67f10f8911b4b4b7d
Link: https://patchwork.kernel.org/comment/22721613/
Fixes: bec6ba4c ("qcom: ipq4019: Add basic board/dts support for IPQ4019 SoC")
Suggested-by: Bjorn Andersson <bjorn.andersson@linaro.org> (clock-output-names)
Signed-off-by: NPavel Kubelun <be.dissent@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> (removed clock rename)
Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211220170352.34591-1-chunkeey@gmail.com

arch/arm/boot/dts/qcom-ipq4019.dtsi

@@ -142,7 +142,8 @@
 	clocks {
 		sleep_clk: sleep_clk {
 			compatible = "fixed-clock";
-			clock-frequency = <32768>;
+			clock-frequency = <32000>;
+			clock-output-names = "gcc_sleep_clk_src";
 			#clock-cells = <0>;
 		};