arm64: dts: qcom: pm6150: Remove macro from unit name of adc-chan

This is just like commit e77cc85e ("arm64: dts: qcom: sdm845:
remove macro from unit name").  It fixes the error in 'make
dtbs_check':

arch/arm64/boot/dts/qcom/sc7180-idp.dt.yaml: adc@3100: 'adc-chan@0x06' does not match any of the regexes: ...
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Fixes: a727ec12 ("arm64: dts: qcom: pm6150: Add PM6150/PM6150L PMIC peripherals")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20191212113540.4.I5f67a5ed7665f658c95447a837cbd0021e1dc689@changeidSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/pm6150.dtsi

@@ -46,7 +46,7 @@ pm6150_adc: adc@3100 {
 			#size-cells = <0>;
 			#io-channel-cells = <1>;
 
-			adc-chan@ADC5_DIE_TEMP {
+			adc-chan@6 {
 				reg = <ADC5_DIE_TEMP>;
 				label = "die_temp";
 			};