arm64: dts: sdm845: Update the device tree node for LLCC

LLCC cache-controller was renamed to system-cache-controller
to make schema pass the dt binding check. Update the device
tree node to reflect this change.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Link: https://lore.kernel.org/r/a2bb92de65e90768bf1d6b8c0b7fbd43cba704d2.1573814758.git.saiprakash.ranjan@codeaurora.org


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