arm64: dts: qcom: sdm845-db845c: drop label from I2C controllers

Geni I2C Controller node does not allow a "label" property and Linux
driver does not parse it:

  sdm845-db845c.dtb: i2c@a8c000: Unevaluated properties are not allowed ('label' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230113145231.79280-1-krzysztof.kozlowski@linaro.org