CONFIG_44x is not available for the selected architecture x86.
Result is shown for architecture powerpc

AMCC 44x, 46x or 47x

modulename: cpu_setup_44x.ko

and/or

head_44x.ko

and/or

44x.ko

and/or

shared.ko

configname: CONFIG_44x

Processor Type
└─>AMCC 44x, 46x or 47x
In linux kernel since version 2.6.15 (release Date: 2006-01-02)
source code:
arch/powerpc/kernel/

is selected by
CONFIG_PPC_256K_PAGES