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

CONFIG_ARCH_HAS_BANDGAP (not configurable)

configname: CONFIG_ARCH_HAS_BANDGAP

Linux Kernel Configuration
└─>ARCH_HAS_BANDGAP
In linux kernel since version 3.11 (release Date: 2013-09-02)  
is depended by
CONFIG_ARCH_EXYNOS