mmc: tegra: remove vcore override late_initcall

mmc: tegra: remove vcore override late_initcall

This patch removes vcore override late_initcall
as it is no longer required for new tuning algo.

In addition this removes two initcalls from
same module and thus let mmc to compile as module.
Along with this unused vairables are removed.

Bug 1499809

Change-Id: Id68d9f4115a860b152703ee6c3fe677eb0230193
Signed-off-by: Shreshtha Sahu <ssahu@nvidia.com>
Reviewed-on: http://git-master/r/402916
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>