KVM: arm64: Upgrade VMID accesses to {READ,WRITE}_ONCE

Since TLB invalidation can run in parallel with VMID allocation,
we need to be careful and avoid any sort of load/store tearing.
Use {READ,WRITE}_ONCE consistently to avoid any surprise.

Cc: Catalin Marinas <[email protected]>
Cc: Jade Alglave <[email protected]>
Cc: Shameer Kolothum <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Reviewed-by: Quentin Perret <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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