CONFIG_SH_7721_SOLUTION_ENGINE is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

SolutionEngine7721

configname: CONFIG_SH_7721_SOLUTION_ENGINE

Linux Kernel Configuration
└─>Board support
└─>SolutionEngine7721
In linux kernel since version 2.6.26 (release Date: 2008-07-13)  
Select 7721 SolutionEngine if configuring for a Hitachi SH7721
evaluation board.