arm64: dts: qcom: fix serial output for sm8250-hdk

The uart2 node has been renamed, apply the change to sm8250-hdk dts too so
that serial output works.

Fixes: 91ed0e90 ("arm64: dts: qcom: add sm8250 hdk dts")
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Link: https://lore.kernel.org/r/20201123143538.14198-1-jonathan@marek.caSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sm8250-hdk.dts

@@ -17,7 +17,7 @@ / {
 	compatible = "qcom,sm8250-hdk", "qcom,sm8250";
 
 	aliases {
-		serial0 = &uart2;
+		serial0 = &uart12;
 	};
 
 	chosen {
@@ -387,7 +387,7 @@ &tlmm {
 	gpio-reserved-ranges = <28 4>, <40 4>;
 };
 
-&uart2 {
+&uart12 {
 	status = "okay";
 };