MAINTAINERS: remove include/linux/of_pwm.h

Added by commit 200efedd8766 ("pwm: Take over maintainership of the PWM
subsystem"), but I could not find any trace of that file being ever
added to the repository.

Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -6135,7 +6135,6 @@ T:	git git://gitorious.org/linux-pwm/linux-pwm.git
 F:	Documentation/pwm.txt
 F:	Documentation/devicetree/bindings/pwm/
 F:	include/linux/pwm.h
-F:	include/linux/of_pwm.h
 F:	drivers/pwm/
 F:	drivers/video/backlight/pwm_bl.c
 F:	include/linux/pwm_backlight.h