[sh4] Delete ineffective setting of CONFIG_PREEMPT_NONE
If multiple options in a "choice" group are enabled, kconfig uses the last (and warns about this). This means that the global default of CONFIG_PREEMPT_VOLUNTARY=y has always overridden the setting of CONFIG_PREEMPT_NONE=y here. Since no-one seems to have complained, assume that the default is OK and remove this.
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