arm64: dts: qcom: sc8280xp: add missing 300MHz

When booting a Thinkpad x13s, we see the message

[    0.997647] cpu cpu0: failed to update OPP for freq=300000

So, lets add in 300MHz to make it happy
Signed-off-by: Steev Klimaszewski <steev@kali.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220718225714.8074-1-steev@kali.org

arch/arm64/boot/dts/qcom/sc8280xp.dtsi

@@ -36,6 +36,9 @@ cpu0_opp_table: cpu0-opp-table {
 		compatible = "operating-points-v2";
 		opp-shared;
 
+		opp-300000000 {
+			opp-hz = /bits/ 64 <300000000>;
+		};
 		opp-403200000 {
 			opp-hz = /bits/ 64 <403200000>;
 		};