arm64: dts: qcom: qdu1000-idp: drop unused LLCC multi-ch-bit-off

arm64: dts: qcom: qdu1000-idp: drop unused LLCC multi-ch-bit-off

There is no "multi-ch-bit-off" property in LLCC, according to bindings
and Linux driver:

  qdu1000-idp.dtb: system-cache-controller@19200000: 'multi-ch-bit-off' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Mukesh Ojha <quic_mojha@quicinc.com>
Link: https://lore.kernel.org/r/20231107080417.16700-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>