x86/vdso: Remove #ifdeffery around page setup variants

Replace the open-coded ifdefs in C sources files with IS_ENABLED().
This makes the code easier to read and enables the compiler to typecheck
also the disabled parts, before optimizing them away.
To make this work, also remove the ifdefs from declarations of used
variables.

Signed-off-by: Thomas Weißschuh <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Cc: Andrew Cooper <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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