CONFIG_HAVE_PWM is not available for the default architecture x86.
Result is shown for architecture blackfin

Enable PWM API support

modulename: pwm.ko
configname: CONFIG_HAVE_PWM

Linux Kernel Configuration
└─> Blackfin Processor Options
└─> Enable PWM API support

Enable support for the Pulse Width Modulation framework (as
found in linux/pwm.h).

To compile this driver as a module, choose M here: the module
will be called pwm.