storage: rotor: Adding SD/eMMC initial support

Rotor can boot to kernel from SD card. This
implementation is currently for SD only. To boot
from the SD card it has been declared as a
fixed_block_device. This will be addressed later

BUG=None
TEST=emerge-rotor sys-boot/depthcharge, boot to kernel.
BRANCH=None

Change-Id: I0ccb2ad6972704cf101ebdbcad91863603c97c2d
Signed-off-by: Calvin Odell <codell@marvell.com>
Reviewed-on: https://chromium-review.googlesource.com/364790
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
6 files changed