CONFIG_ARCH_LPC32XX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

NXP LPC32XX

modulename: clk-lpc32xx.ko

and/or

irq-lpc32xx.ko

and/or

gpio-lpc32xx.ko

configname: CONFIG_ARCH_LPC32XX

Linux Kernel Configuration
└─>NXP LPC32XX
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
Support for the NXP LPC32XX family of processors

source code:
drivers/irqchip/irq-lpc32xx.c
selects
CONFIG_ARM_AMBA
CONFIG_CLKSRC_LPC32XX
CONFIG_CPU_ARM926T
CONFIG_GPIOLIB
CONFIG_CLKDEV_LOOKUP
CONFIG_COMMON_CLK
CONFIG_GENERIC_CLOCKEVENTS
CONFIG_GENERIC_IRQ_MULTI_HANDLER
CONFIG_SPARSE_IRQ
CONFIG_USE_OF
CONFIG_MULTI_IRQ_HANDLER