Arm: tegra: Remove emc clock client for cpu

It removes emc clock client created for scaling emc freq
due to cpu to emc static coupling.ratio.

Now emc scaling due to cpu request is taken care by
MCCPU actmon device.

Bug 1311829

Change-Id: I320d37396a773102ecd7fdfa1934834db9bf34df
Signed-off-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-on: http://git-master/r/244778
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Venkata (Muni) Anda <vanda@nvidia.com>