emile: adjust to the spec of emile

o. Make some gpio changes base on Emile spec.
o. Init sdmmc function.
o. Revert cpu freq reducing in recovery mode since Emile
   have more effective thermal than Mickey.
o. Revert the changes of lpddr3-samsung-2GB config.

BUG=chrome-os-partner:46658
TEST=build and boot on Emile
BRANCH=veyron

Change-Id: Ib2c78c9b5e3ac6620ab1772879a7ea0f7007f96e
Signed-off-by: ZhengShunQian <zhengsq@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/307651
Commit-Ready: Shunqian Zheng <zhengsq@rock-chips.com>
Tested-by: Shunqian Zheng <zhengsq@rock-chips.com>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
7 files changed