jsonplatform.c: Disable i2c bus in case of bus count being high but busses are undefined
jsonplatform.c: Disable i2c bus in case of bus count being high but busses are undefined

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

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