pkg/vcs: add more cherry-picks for Linux

[a-nogikh]

We cherry-pick some known fixes to make sure that older kernel revisions remain buildable and bootable by our infrastructure during bug bisections.

Thanks to @kaloronahuang for sharing the bigger list of such commits.

[
    {
        "fix_hash": "1d489151e9f9d1647110277ff77282fe4d96d09b",
        "fix_title": "objtool: Don't fail on missing symbol table"
    },
    {
        "fix_hash": "52a9dab6d892763b2a8334a568bd4e2c1a6fde66",
        "fix_title": "libsubcmd: Fix use-after-free for realloc(..., 0)"
    },
    {
        "fix_hash": "0711f0d7050b9e07c44bc159bbc64ac0a1022c7f",
        "fix_title": "pid: take a reference when initializing `cad_pid"
    },
    {
        "guilty_hash": "db2b0c5d7b6f19b3c2cab08c531b65342eb5252b",
        "fix_hash": "82880283d7fcd0a1d20964a56d6d1a5cc0df0713",
        "fix_title": "objtool: Fix truncated string warning"
    },
    {
        "fix_hash": "644106cdb89844be2496b21175b7c0c2e0fab381",
        "fix_title": "power: reset: ltc2952: Fix use of floating point literals"
    },
    {
        "fix_hash": "310780e825f3ffd211b479b8f828885a6faedd63",
        "fix_title": "usb: dwc2: hcd_queue: Fix use of floating point literal",
        "force_merge": true
    },
    {
        "fix_hash": "760f8522ce08a24abac3208290f93fe3fffc0d6c",
        "fix_title": "selinux: use kernel linux/socket.h for genheaders and mdp"
    },
    {
        "fix_hash": "1e1b6d63d6340764e00356873e5794225a2a03ea",
        "fix_title": "lib/string.c: implement stpcpy"
    }
]

We need to fill in some of the guilty_hash values and incorporate the list in pkg/vcs.