arm64: dts: qcom: msm8939-samsung-a7: Drop internal pull for SD CD

A7 seems to have external pull-up for the SD card chip detect (like
most MSM8916/MSM8939 devices) so drop the internal pull-up. It's not
necessary.

Tested-by: "Lin, Meng-Bo" <linmengbo0689@protonmail.com>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20230723-a7sdc2cdnopull-v1-1-699fd730afcb@gerhold.net
Signed-off-by: Bjorn Andersson <andersson@kernel.org>