Add dummy implemention of public symbols for compilation-safe inclusion
of include/linux/pwm.h file when CONFIG_PWM is not defined.
Reported-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>