video: tegra: host: pod: Remove pdata usage

video: tegra: host: pod: Remove pdata usage

This far pod governor has relied on the nvhost platform data which
has made using the driver outside nvhost framework impossible. This
patch modifies the governor so that it can be used for scaling any
platform device.

Bug 1454499

Change-Id: Ifcc7b831ce293049f628a369a21b19b5185e42d2
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/376555
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>