arm64: dts: qcom: msm8994: Add mmc aliases

Set the aliases for both SDHCI controllers.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Reviewed-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220319174645.340379-16-konrad.dybcio@somainline.org