linux, linux-esx: build every 5.0 subrelease from one spec

[dcasota]

Problem

Photon 5.0 keeps two copies of each kernel spec: SPECS/90/linux/linux.spec and linux-esx.spec build kernel 6.1 for photon_subrelease 90 and below, SPECS/linux/ builds 6.12 from 91. Every change that is not kernel-specific — dependencies, sections, the canister logic, the acvp/kat refusal — has to be made twice, and the two copies drift.

Change

SPECS/linux/linux.spec and linux-esx.spec now build every 5.0 subrelease, on x86_64 and aarch64, and replace SPECS/90/linux/linux.spec and linux-esx.spec.

Version, Source0, the dependencies both kernels share, the acvp/kat refusal and every section are written once, with photon_subrelease conditionals where the kernels differ. Each kernel's preamble (Release, FIPS model, sources, patches) and changelog live in <flavour>-<kernel>.inc and <flavour>-<kernel>-changelog.inc; linux.spec also takes the subpackages whose descriptions differ from linux-<kernel>-packages.inc.

The 6.1 files move to SPECS/linux: included files to the top level, where SpecParser.py resolves includes, everything else under 6.1/. A name that already exists for 6.12 with other content gets a -6.1 suffix, because Photon stages sources by file name. The 6.1 archives join config.yaml. linux-rt stays in SPECS/90/linux with the files it uses.

Testing

• rpm (rpmspec -P, preamble and queries) and Photon's SpecParser.py read both specs exactly as before for subreleases 90, 91 and 92, on x86_64 and aarch64, with and without canister_build, acvp_build and kat_build: 48 cases plus kernel selection and source mapping, all identical.
• Six x86_64 ISOs (minimal and full; photon-os-installer 2.8 and 2.9; prebuilt and locally built canister) were built from this branch and passed the sharukhan permutation run.
• aarch64 was checked statically only (identical %prep and preprocessed spec); no aarch64 build host was available.

Dependencies

• Based on linux, linux-esx: make canister_build work against the current kernel #29 (and linux, linux-esx: share the canister/.config logic via canister_config.inc #24); this change follows them.
• check_spec needs spec-checker: check a spec as the subrelease being checked sees it #34 to read a spec that serves several subreleases.
• make image needs spec-generator: read kernel specs as the current subrelease sees them #35: the kernel-deps generator otherwise crashes on the single spec.

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