video: tegra: host: save devfreq_rate in scale3d

video: tegra: host: save devfreq_rate in scale3d

Save 3d clock and 3d.emc clock to devfreq_rate.
This allows nvhost to set current devfreq_rate
before it goes idle instead of setting default_rate
which is max frequency for 3d.

Bug 1166272

Change-Id: I204625dabb5248b8b9004622fd6ddc5db773e3f3
Signed-off-by: Jihoon Bang <jbang@nvidia.com>
Reviewed-on: http://git-master/r/169184
Reviewed-by: Ilan Aelion <iaelion@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijay Gupta <vijayg@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>