Add combined DTB image tooling and DTB-agnostic GRUB configuration #238

Job	Run time
qcom-preflight-checks / semgrep/ci	1m 39s
qcom-preflight-checks / repolinter	31s
qcom-preflight-checks / dependency-review	4s
qcom-preflight-checks / copyright-license-check	52s
qcom-preflight-checks / commit-emails-check	7s
	3m 13s

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