arm64: dts: qcom: sm8450: Add TCSR halt register space

Add TCSR register space and refer it from scm node, so that
it can be used by SCM driver.

Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/1673513697-30173-2-git-send-email-quic_mojha@quicinc.com