mmc: tegra: added tuning support

mmc: tegra: added tuning support

-Ported tuning related functions from
k-3.18 to k-4.4
-Ported functions to set trim/tap values

Change-Id: Ie873c5aa8ede00420a371d2379367835ae689c0f
Signed-off-by: Anubhav Jain <anubhavj@nvidia.com>
Signed-off-by: R Raj Kumar <rrajk@nvidia.com>
Signed-off-by: Naveen Kumar Arepalli <naveenk@nvidia.com>
Reviewed-on: http://git-master/r/1164070
GVS: Gerrit_Virtual_Submit
Reviewed-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Reviewed-by: Venu Byravarasu <vbyravarasu@nvidia.com>