[Nakasi] Do not disable PWM clock when kernel inits.

Bug: 6522893

Change-Id: I808cde9fac3dff141f8dff934e0eec9fa6433b54
ARM: tegra: clock: Don't fail clk_enable when max_rate has been lowered

Rebase-Id: Rea679b3ebef177d19f96bfc298d1f5da8588d6ad