ARM: dts: msm: move SD card detect to legacy mechanism for SDM845

We have shared gpio for SD and UFS card hotplug detection which required
us to use the extcon-gpio framework to take care of the hot plug event
detection. Now that UFS card feature is disabled, we no longer need
to use the extcon-gpio framework and simply use the legacy card detect
framework for SD card hot plug detection.

Change-Id: If9fdbd95f6fbe6ed766c5dde3c21f5a81a4fb163
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>