mm: don't schedule deferred kernel page table freeing while booting

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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/pgtable-generic.c"
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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/pgtable-generic.c"
                    ],
                    "versions": [
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                            "lessThan": "6.18.57",
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                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "lessThan": "7.2.11",
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                            "versionType": "semver"
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                }