arm64: dts: qcom: qdu1000: Add LLCC/system-cache-controller

Add a DT node for Last level cache (aka. system cache) controller
which provides control over the last level cache present on QDU1000
and QRU1000 SoCs.

Signed-off-by: Komal Bajaj <quic_kbajaj@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230313125731.17745-1-quic_kbajaj@quicinc.com