pwm: Remove .can_sleep from struct pwm_chip

All PWM devices have been marked as "might sleep" since v4.5, there is
no longer a need to differentiate on a per-chip basis.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-pca9685.c

@@ -343,7 +343,6 @@ static int pca9685_pwm_probe(struct i2c_client *client,
 
 	pca->chip.dev = &client->dev;
 	pca->chip.base = -1;
-	pca->chip.can_sleep = true;
 
 	return pwmchip_add(&pca->chip);
 }