CONFIG_HAVE_AT91_SAM9X60_PLL is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_HAVE_AT91_SAM9X60_PLL (not configurable)

modulename: clk-sam9x60-pll.ko

configname: CONFIG_HAVE_AT91_SAM9X60_PLL

Linux Kernel Configuration
└─>AT91/Microchip SoCs
└─>HAVE_AT91_SAM9X60_PLL
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
source code:
drivers/clk/at91/clk-sam9x60-pll.c