x86/platform/uv: Provide is_early_uv_system()

Introduce is_early_uv_system() which uses efi.uv_systab to decide early
in the boot process whether the kernel runs on a UV system.

This is needed to skip other early setup/init code that might break
the UV platform if done too early such as before necessary ACPI tables
parsing takes place.

Suggested-by: Hedi Berriche <[email protected]>
Signed-off-by: Mike Travis <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Russ Anderson <[email protected]>
Reviewed-by: Dimitri Sivanich <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Russ Anderson <[email protected]>
Cc: Dimitri Sivanich <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Kate Stewart <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Philippe Ombredanne <[email protected]>
Cc: Pavel Tatashin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Dou Liyang <[email protected]>
Cc: Xiaoming Gao <[email protected]>
Cc: Rajvi Jingar <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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