clk: pwm: Make use of non-sleeping PWMs

For some PWMs applying a configuration doesn't sleep. For these enabling
and disabling can be done in the clk callbacks .enable() and .disable()
instead of .prepare() and .unprepare().

Do that to possibly reduce the time the PWM is enabled and so save some
energy.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/d2f748101194409fb410711380ea52ed33260644.1746006578.git.ukleinek@baylibre.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>