arm64: dts: qcom: msm8994: Add SDHCI2 node

Add SDHCI2 to enable use of uSD cards on msm8994.

Signed-off-by: Konrad Dybcio <konradybcio@gmail.com>
Link: https://lore.kernel.org/r/20201005150313.149754-7-konradybcio@gmail.com


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>