arm64: dts: qcom: sdm630: correct I2C8 pin functions

The I2C8 pins are split into i2c8_a (GPIO30 and GPIO31) and i2c8_b
(GPIO44 and GPIO52).  Correct the name of function for I2C8 pins.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221011190231.76784-2-krzysztof.kozlowski@linaro.org