arm64: dts: qcom: pm6150l: Add missing include

Add missing include to make it compile.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210923162204.21752-17-konrad.dybcio@somainline.org