pwm: Update MAINTAINER entry
There is little sense in having gpio-mvebu and pwm-backlight explicitly
listed in the PWM entry. Drop these and add the keywords that actually
identify a driver as PWM related.
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260115165055.1739004-2-ukleinek@kernel.org
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>