pwm: atmel: Drop driver local locking

The two functions making use of the lock are only called transitively from
.apply(). Calls to .apply() are already serialized by the pwm core so the
lock in the driver has no effect and can safely be dropped.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/5ad3417aecd4dc6eca9699e21691e3725ea0bb87.1750788649.git.u.kleine-koenig@baylibre.com


Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>