ARM: dts: qcom: remove commented mmc-ddr-1_8v for sdcc3

This property appears to be commented out, so we can remove it
as well.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Link: https://lore.kernel.org/r/20200902165159.7733-2-freifunk@adrianschmutzler.de


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