arm: tegra: edp: clean up and refactor edp code

arm: tegra: edp: clean up and refactor edp code

Replace 'leakage' with 'powermodel' as it includes dynamic model.
Use common routines and strucutres for GPU and CPU.
Removed old t2, t3, t11x and t14x code.
Switched to using kstrtoul instead of insecure simple_strtoul.
Clean up camel case.

Bug 1434482

Change-Id: I16f107b16f1743998bf56877023d30eba6a7b9d0
Signed-off-by: Diwakar Tundlam <dtundlam@nvidia.com>
Reviewed-on: http://git-master/r/412408
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit