dax/fsdev: use __va(phys) for kaddr in direct_access

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/dax/dax-private.h",
                        "drivers/dax/fsdev.c"
                    ],
                    "versions": [
                        {
                            "version": "759455848df0b9ac3acabdbedcdc4a55af67935f",
                            "lessThan": "7b642bd3d39105eef4d5908970726c5fda291b53",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "759455848df0b9ac3acabdbedcdc4a55af67935f",
                            "lessThan": "ff7c73fca793bd5c29a15ba735b0886f62f3a840",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/dax/dax-private.h",
                        "drivers/dax/fsdev.c"
                    ],
                    "versions": [
                        {
                            "version": "7.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.6",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }