overlay.d: drop 40grub

[HuijingHei]

Also drop in PR coreos/fedora-coreos-config#3407

[openshift-ci]

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[openshift-ci]

@HuijingHei: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/rhcos-9-build-test-metal	7fe3074	link	true	/test rhcos-9-build-test-metal
ci/prow/scos-9-build-test-metal	7fe3074	link	true	/test scos-9-build-test-metal
ci/prow/scos-9-build-test-qemu	7fe3074	link	true	/test scos-9-build-test-qemu
ci/prow/e2e-aws	7fe3074	link	false	/test e2e-aws
ci/prow/rhcos-9-build-test-qemu	7fe3074	link	true	/test rhcos-9-build-test-qemu

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[dustymabe]

#1759 (comment)

I suggest closing this.