arm64: dts: qcom: msm8996: add blsp1_i2c6 node

Add support for the sixth I2C interface on the MSM8996 SoC.

Signed-off-by: Harry Austen <hpausten@protonmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221023204505.115141-3-hpausten@protonmail.com