CONFIG_SH_HS7751RVOIP is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
default or selected kernelversion does not have config value CONFIG_SH_HS7751RVOIP.
Result is shown for kernelversion 5.4.123

HS7751RVOIP

configname: CONFIG_SH_HS7751RVOIP

SuperH system type
└─>HS7751RVOIP
In linux kernel since version 2.6.12  
Select HS7751RVOIP if configuring for a Renesas Technology
Sales VoIP board.