arm64: dts: qcom: sm8250: Add TCSR halt register space

Enable download mode for sm8250 which can help collect
ramdump for this SoC.

Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/1698253601-11957-2-git-send-email-quic_mojha@quicinc.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>