CONFIG_PPC_85xx is not available for the selected architecture x86.
Result is shown for architecture powerpc

Freescale 85xx

modulename: misc.ko

configname: CONFIG_PPC_85xx

Processor Type
└─>Freescale 85xx
In linux kernel since version 2.6.17 (release Date: 2006-06-17)
source code:
arch/powerpc/platforms/85xx/misc.c

is selected by
CONFIG_MTD_NAND_FSL_UPM