arm64: dts: qcom: sc7280: add slimbus DT node

Populate the DTSI node for slimbus instance to be
used by bluetooth FM audio case.

Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com>
Link: https://lore.kernel.org/r/20240215090910.30021-1-quic_vdadhani@quicinc.com


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