CONFIG_CPU_SH4AL_DSP is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

CONFIG_CPU_SH4AL_DSP (not configurable)

configname: CONFIG_CPU_SH4AL_DSP

Linux Kernel Configuration
└─>Processor selection
└─>CPU_SH4AL_DSP
In linux kernel since version 2.6.19 (release Date: 2006-11-29)  

is selected by
CONFIG_PMB