pwm: Remove unused function pwmchip_add_inversed()

This is only defined with CONFIG_PWM unset and was introduced together
with pwmchip_add_with_polarity() (which is only defined with CONFIG_PWM
enabled). I guess the series that introduced pwmchip_add_with_polarity()
had a different concept in earlier revisions and the !CONFIG_PWM part
was just not updated accordingly.

Given that there is no implementation for pwmchip_add_with_polarity()
without CONFIG_PWM, just drop pwmchip_add_inversed() instead of renaming
it to pwmchip_add_with_polarity().
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

include/linux/pwm.h

@@ -473,11 +473,6 @@ static inline int pwmchip_add(struct pwm_chip *chip)
 	return -EINVAL;
 }
 
-static inline int pwmchip_add_inversed(struct pwm_chip *chip)
-{
-	return -EINVAL;
-}
-
 static inline int pwmchip_remove(struct pwm_chip *chip)
 {
 	return -EINVAL;