MMC: Move Samsung specific e-MMC code out of generic code

I originally put the command to read the SMART information out of
Samsung e-MMCs in the generic code because I thought I needed to
use private MMC interfaces to accomplish it.  I now know better
and am moving the command out to its own separate file.

Change-Id: I9b71a2da342dbff0122910c38bde48274d07452c
Signed-off-by: Scott Anderson <saa@android.com>
3 files changed