arm64: dts: qcom: sdm845: remove macro from unit name

Unit name is supposed to be a number, using a macro with hex value is
not recommended, so add the value in unit name.

arch/arm64/boot/dts/qcom/pm8998.dtsi:81.18-84.6: Warning (unit_address_format): /soc/spmi@c440000/pmic@0/adc@3100/adc-chan@0x06: unit name should not have leading "0x"
arch/arm64/boot/dts/qcom/pm8998.dtsi:81.18-84.6: Warning (unit_address_format): /soc/spmi@c440000/pmic@0/adc@3100/adc-chan@0x06: unit name should not have leading 0s

Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>