arm64: dts: qcom: sm8450: Add LLCC/system-cache-controller node

Add a DT node for Last level cache (aka. system cache) controller
which provides control over the last level cache present on SM8450
SoC.

Signed-off-by: Sai Prakash Ranjan <quic_saipraka@quicinc.com>
Tested-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/7995d003b77d5e066658af5b2cfa22ccb40b6cf7.1643355594.git.quic_saipraka@quicinc.com