x86/mm/KASLR: Reduce randomization granularity for 5-level paging to 1GB

The current randomization granularity of 5-level is 512 GB. The mapping of
the real mode trampoline has been reduced to one PUD entry, so there is no
restriction anymore.

Reduce the granularity to 1GB for 5-level paging mode which allows better
randomization.

[ tglx: Massaged changelog ]

Signed-off-by: Baoquan He <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]

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