[PATCH] arch: unify handling of syscall.tbl in arch-syscall-validate

[PATCH] arch: unify handling of syscall.tbl in arch-syscall-validate

Apart from de-duplication of logic, this refactor is also going to help
syncing to the Linux 6.11+ definitions, where all architectures are
converted to source their syscall definitions from syscall.tbl files.

The change is tested on Linux 6.2 sources to not affect the generated
syscalls.csv apart from timestamp changes.

Signed-off-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Gbp-Pq: Name arch_unify_handling_of_syscall.tbl_in_arch-syscall-validate.patch