fix oval of grub2_kernel_trust_cpu_rng

[vojtapolasek]

Description:

• an old name was left as oval ID

• also changed platform to machine, as grub2 platform is inherited from the group

Rationale:

• Rationale here. Replace this text. Don't use the italics format!

• Fixes # Issue number here (e.g. Updating sysctl XCCDF naming #26) or remove this line if no issue exists.

[openscap-ci]

Changes identified:
Rules:
 grub2_kernel_trust_cpu_rng

Show details

Rule grub2_kernel_trust_cpu_rng:
 Attribute value changed in OVAL check.

Recommended tests to execute:
 build_product rhel8
 tests/test_suite.py rule --libvirt qemu:///system test-suite-vm --remediate-using bash --datastream build/ssg-rhel8-ds.xml grub2_kernel_trust_cpu_rng

[openshift-merge-robot]

@vojtapolasek: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-rhcos4-moderate	0df8053	link	/test e2e-aws-rhcos4-moderate
ci/prow/e2e-aws-rhcos4-e8	0df8053	link	/test e2e-aws-rhcos4-e8
ci/prow/e2e-aws-ocp4-cis-node	0df8053	link	/test e2e-aws-ocp4-cis-node

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[mildas]

LGTM, it works properly and not resulting in notchecked. Thanks