pwm.c: Remove manual gpio muxing when using a pin that has both pwm & gpio enabled
pwm.c: Remove manual gpio muxing when using a pin that has both pwm & gpio enabled

This fixes PWM on the GT platform. The code was only used on gen1 galileo and
is rarely used because it's the only platform in mraa that supports 2 functions
on the same pin without any time of advanced function pointer being called
(gen2/edison). GT however has kernel side muxing which causes the gpio to be
initialised meaning the PWM channel is never set to active as it's activated
after the GPIO is opened and the GPIO keeps precendence

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

spitfire88/mraa,Hbrinj/mraa,arfoll/mraa,stefan-andritoiu/mraa,yongli3/mraa,w4ilun/mraa,stefan-andritoiu/mraa,w4ilun/mraa,arfoll/mraa,intel-iot-devkit/mraa,alext-mkrs/mraa,andreivasiliu2211/mraa,andreivasiliu2211/mraa,Hbrinj/mraa,malikabhi05/mraa,KurtE/mraa,alext-mkrs/mraa,alext-mkrs/mraa,sergev/mraa,ProfFan/mraa,Jon-ICS/mraa,Hbrinj/mraa,jontrulson/mraa,ncrastanaren/mraa,g-vidal/mraa,w4ilun/mraa,jontrulson/mraa,Propanu/mraa,whbruce/mraa,malikabhi05/mraa,arfoll/mraa,yongli3/mraa,KurtE/mraa,stefan-andritoiu/mraa-gpio-chardev,andreivasiliu2211/mraa,stefan-andritoiu/mraa,ProfFan/mraa,Propanu/mraa,alext-mkrs/mraa,ncrastanaren/mraa,intel-iot-devkit/mraa,arunlee77/mraa,whbruce/mraa,petreeftime/mraa,intel-iot-devkit/mraa,stefan-andritoiu/mraa-gpio-chardev,alext-mkrs/mraa,intel-iot-devkit/mraa,KurtE/mraa,Propanu/mraa,yongli3/mraa,jontrulson/mraa,petreeftime/mraa,stefan-andritoiu/mraa-gpio-chardev,intel-iot-devkit/mraa,malikabhi05/mraa,ProfFan/mraa,petreeftime/mraa,stefan-andritoiu/mraa,Propanu/mraa,arunlee77/mraa,arunlee77/mraa,jontrulson/mraa,g-vidal/mraa,Jon-ICS/mraa,spitfire88/mraa,yongli3/mraa,sergev/mraa,ncrastanaren/mraa,sergev/mraa,ncrastanaren/mraa,jontrulson/mraa,sergev/mraa,whbruce/mraa,g-vidal/mraa,g-vidal/mraa,arfoll/mraa,Hbrinj/mraa,Propanu/mraa,spitfire88/mraa,arunlee77/mraa,stefan-andritoiu/mraa-gpio-chardev,sergev/mraa,ProfFan/mraa,malikabhi05/mraa,spitfire88/mraa,andreivasiliu2211/mraa,whbruce/mraa,stefan-andritoiu/mraa-gpio-chardev,KurtE/mraa,KurtE/mraa,ncrastanaren/mraa,malikabhi05/mraa,yongli3/mraa,petreeftime/mraa,Jon-ICS/mraa,w4ilun/mraa,stefan-andritoiu/mraa,g-vidal/mraa,arfoll/mraa