CONFIG_APM821xx is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_APM821xx (not configurable)

configname: CONFIG_APM821xx

Linux Kernel Configuration
└─>APM821xx
In linux kernel since version 2.6.37 (release Date: 2011-01-04)  

is depended by
CONFIG_BLUESTONE