default or selected kernelversion does not have config value CONFIG_SPI_INTEL_SPI.
Result is shown for kernelversion 6.9.9

CONFIG_SPI_INTEL_SPI (not configurable)

modulename: intel-spi.ko

configname: CONFIG_SPI_INTEL_SPI

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>SPI NOR device support
└─>SPI_INTEL_SPI
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
drivers/mtd/spi-nor/controllers/intel-spi.c