CONFIG_S3C24XX_PWM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

PWM device support

configname: CONFIG_S3C24XX_PWM

Linux Kernel Configuration
└─>Samsung Common options
└─>PWM device support
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Support for exporting the PWM timer blocks via the pwm device
system