platform: tegra: emc: Timer update

platform: tegra: emc: Timer update

Several changes:

  1. Fix an annoying bug in the MR4 poll function where a
     warning would get spit if you forced test polling
     before setting the polling test value to something
     meaningful.
  2. Homogenize the timer naming scheme a bit.
  3. Make all of the EMC timers defferable.
  4. Make the timers controllable by both the CDEV and the
     clock change itself (if it so desires).

TODO:

Implement DT field in the EMC DT node to specify whether or
not a frequency based MR4 polling threshold should be used.
This will require a change in the EMC DT tool.

Change-Id: I9ee8926da31e0265a68244131474f43454bd230d
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/711279
Reviewed-by: Robert Shih <rshih@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: Robert Shih <rshih@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>