CONFIG_ARCH_BCM2835 is not available for the selected architecture x86.
Result is shown for architecture arm

Broadcom BCM2835 family

modulename: irq-bcm2835.ko

and/or

irq-bcm2836.ko

and/or

bcm2835-pm.ko

configname: CONFIG_ARCH_BCM2835

Linux Kernel Configuration
└─>Broadcom SoC Support
└─>Broadcom BCM2835 family
In linux kernel since version 3.1 (release Date: 2011-10-24)
This enables support for the Broadcom BCM2711 and BCM283x SoCs.
This SoC is used in the Raspberry Pi and Roku 2 devices.
source code:
drivers/irqchip/irq-bcm2835.c