x86/asm/purgatory: Start using annotations

Purgatory used no annotations at all. So include linux/linkage.h and
annotate everything:

* code by SYM_CODE_*
* data by SYM_DATA_*

 [ bp: Fixup comment in gdt: ]

Signed-off-by: Jiri Slaby <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Alexios Zavras <[email protected]>
Cc: Allison Randal <[email protected]>
Cc: Enrico Weigelt <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: [email protected]
Cc: Thomas Gleixner <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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