KVM: arm64: Mark some VM-scoped allocations as __GFP_ACCOUNT

KVM: arm64: Mark some VM-scoped allocations as __GFP_ACCOUNT

Generally speaking, any memory allocations that can be associated with a
particular VM should be charged to the cgroup of its process.
Nonetheless, there are a couple spots in KVM/arm64 that aren't currently
accounted:

 - the ccsidr array containing the virtualized cache hierarchy

 - the cpumask of supported cpus, for use of the vPMU on heterogeneous
   systems

Go ahead and set __GFP_ACCOUNT for these allocations.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Link: https://lore.kernel.org/r/20230206235229.4174711-1-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>