core-system-conf: fix /boot device - mrrl - Minimal Reliable Reproducible Linux

commit 34fac5a35bb9a3eee3c23b0af59d2e553cbe48cf
parent b1e588d3743ac01e195b5184fa29bad1e3a80971
Author: ccx <ccx@te2000.cz>
Date:   Thu,  7 Mar 2024 20:22:32 +0000

core-system-conf: fix /boot device

	mrrl Minimal Reliable Reproducible Linux
	git clone https://ccx.te2000.cz/git/mrrl
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