mmc: host: Enable packed command for eMMC4.5

mmc: host: Enable packed command for eMMC4.5

Enable  packed command support for eMMC4.5 devices

Bug 1242730

Reviewed-on: http://git-master/r/203327
(cherry picked from commit 054cea30d66b938258d3778cb9cf18026c77d714)
Signed-off-by: Naveen Kumar Arepalli <naveenk@nvidia.com>
Reviewed-on: http://git-master/r/220963
(cherry picked from commit c9ebcd12fd55cc996f5e23a35e8484bc631b05a0)
Change-Id: I6c68c5477cd20b49230ac04f17351de8ff4a3b1d
Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Reviewed-on: http://git-master/r/739054