mraa_internal.h: Add internal definition for mraa_atoi
mraa_internal.h: Add internal definition for mraa_atoi

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

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