CONFIG_HAVE_PWM is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_HAVE_PWM (not configurable)

modulename: pwm.ko

configname: CONFIG_HAVE_PWM

Linux Kernel Configuration
└─>HAVE_PWM
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
source code:
arch/arm/plat-samsung/pwm.c