The timer clock feeds the timer block, which, among other things, is
used to drive the SOR lane sequencer. Since the Tegra timer driver is
not enabled on 64-bit ARM, nothing currently claims that clock and it
gets disabled by the common clock framework at late_init time.

Given the non-obvious dependencies, the timer clock can be considered
a critical part of the SoC infrastructure, requiring its clock source
to be always on.
Acked-by: Rhyland Klein <rklein@nvidia.com>
Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>