ARM: dts: msm: change to polling way of SD card for 8939 SKUK

remove non-removeable to adopt polling way of SD card. Due to
from HW structure, still can hot swap SD card although HW do
not has cd-gpio.

Change-Id: Ib06e86a5418c6cd7d7159c83f48f27a901e3cce3
Signed-off-by: Guoping Yu <guopingy@codeaurora.org>