arm64: dts: qcom: ipq6018: move ARMv8 timer out of SoC node

The ARM timer is usually considered not part of SoC node, just like
other ARM designed blocks (PMU, PSCI).  This fixes dtbs_check warning:

arch/arm64/boot/dts/qcom/ipq6018-cp01-c1.dtb: soc: timer: {'compatible': ['arm,armv8-timer'], 'interrupts': [[1, 2, 3848], [1, 3, 3848], [1, 4, 3848], [1, 1, 3848]]} should not be valid under {'type': 'object'}
	From schema: dtschema/schemas/simple-bus.yaml

Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220927201218.1264506-2-robimarko@gmail.com