CHROMIUM: exynos: dts: configure SDIO for Wifi

CHROMIUM: exynos: dts: configure SDIO for Wifi

The Wifi SDIO card is on the MMC1 interface,
and the MMC3 interface is no longer connected to anything.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BUG=chrome-os-partner:14489
TEST=run on Spring and attach to the guest wifi network from the UI

Change-Id: I42b2a96c67b61a6f220e12c1bd1242d7919c5e9a
Reviewed-on: https://gerrit.chromium.org/gerrit/36301
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Sam Leffler <sleffler@chromium.org>