arm64: dts: qcom: qcs404: Add TCSR node

The bus halt registers in TCSR are referenced as a syscon device, add
these so that we can reference them from the remoteproc nodes.

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