board: msm7x27a: Configure SDC2 GPIOs (in sleep state) correctly

SDC2 GPIOs have external pull up through VREG_S3 which is always on
regulator. Configuring SDC2 GPIOs (CLK, CMD, DAT) as PULL_DOWN
during sleep (when wifi is disabled) cause leakage current. Fix this
by configuring them as PULL_UP. This also ensures that the GPIOs
from host side are always active high as per SDIO spec.

Change-Id: Ibcc16bd92ab872bdbdeb814b95e901487c5fc224
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>