arm64: dts: qcom: msm8996: Add BLSP2_I2C5 and BLSP2_I2C6

Add the fifth and sixth I2C host on the second BLSP, used for
various board-specific peripherals.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210228130831.203765-5-konrad.dybcio@somainline.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>