ARM: tegra: clock: Set clock to fixed rate if set

ARM: tegra: clock: Set clock to fixed rate if set

If for a particular clock, fixed rate is specified, then always set that
clock at that rate, irrespective of rate requested by driver

Bug 1410210
Bug 1468321
Bug 200017463

Signed-off-by: Ashwin Joshi <asjoshi@nvidia.com>
Reviewed-on: http://git-master/r/414920
(cherry picked from commit ba6743dd0aa8f5669fcabdfba08690df0c4ef2ad)

Change-Id: Icdac8ca0ce4238dcb79dbdcaaec1250d4829a4eb
Signed-off-by: Jinyoung Park <jinyoungp@nvidia.com>
Reviewed-on: http://git-master/r/434033
Reviewed-by: Joshua Cha <joshuac@nvidia.com>
Reviewed-by: Aleksandr Frid <afrid@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>