defconfig: Add Wlan SDIO config flag

SDIO driver is required for WLAN high latency data path.
The compilation flag is added to enable wlan SDIO driver
build.

Change-Id: Idbe529a295b57f1f7e5d0578fce2413b97f58d11
Signed-off-by: Peng Xu <pxu@codeaurora.org>
Merge "defconfig: Add Wlan SDIO config flag"