arm64/boot: Move global CPU override variables out of BSS

Accessing BSS will no longer be permitted from the startup code in
arch/arm64/kernel/pi, as some of it executes before BSS is cleared.
Clearing BSS earlier would involve managing cache coherency explicitly
in software, which is a hassle we prefer to avoid.

So move some variables that are assigned by the startup code out of BSS
and into .data.

Signed-off-by: Ard Biesheuvel <[email protected]>
Tested-by: Yeoreum Yun <[email protected]>
Reviewed-by: Yeoreum Yun <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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