arm64: dts: qcom: qcs404: Move lpass and q6 into soc

Although we don't describe lpass and wcss with all the details needed to
control them in a Trustzone-less environment, move them under soc in
order to tidy up the structure and prepare for describing them fully.

Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <agross@kernel.org>