arm64: dts: qcom: ipq6018: add missing TCSR syscon compatible

TCSR syscon node should come with dedicated compatible.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220909092035.223915-6-krzysztof.kozlowski@linaro.org