tegra: dc: Round up target HDMI rate

tegra: dc: Round up target HDMI rate

Since Tegra Clock Framework rounds down when module clock divider is
determined, rounded up target rate for sor clock switch to compensate.

Bug 200162245

Change-Id: Ic6fde0ebf32143609a399a9f6ed2b6805d9f7029
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/926981
(cherry picked from commit 2dfc8941dc6c64cdf5d888c6c2dc55332d024962)
Reviewed-on: http://git-master/r/927853
Reviewed-by: Aly Hirani <ahirani@nvidia.com>
Tested-by: Aly Hirani <ahirani@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-by: Naveen Kumar S <nkumars@nvidia.com>