Remove initramfs/vmlinuz references for mac bundles

[praveenkumar]

After crc-org/crc#4309 we don't need to use those references for running the bundle on macOS so better to remove this unused code/reference.

fixes: #992

[openshift-ci]

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[praveenkumar]

/hold

This need to be tested first for mac.

[praveenkumar]

/cherry-pick release-4.18

[openshift-cherrypick-robot]

@praveenkumar: once the present PR merges, I will cherry-pick it on top of release-4.18 in a new PR and assign it to you.

In response to this:

/cherry-pick release-4.18

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[praveenkumar]

/cherry-pick release-4.17

[openshift-cherrypick-robot]

@praveenkumar: once the present PR merges, I will cherry-pick it on top of release-4.17 in a new PR and assign it to you.

In response to this:

/cherry-pick release-4.17

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[praveenkumar]

/retest

[openshift-ci]

@praveenkumar: 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/e2e-microshift	a717135	link	true	/test e2e-microshift
ci/prow/e2e-snc	a717135	link	true	/test e2e-snc

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