KVM: PPC: Add cache flush on page map

KVM: PPC: Add cache flush on page map

When we map a page that wasn't icache cleared before, do so when first
mapping it in KVM using the same information bits as the Linux mapping
logic. That way we are 100% sure that any page we map does not have stale
entries in the icache.

Signed-off-by: Alexander Graf <agraf@suse.de>
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v1 -> v2:

  - move code to arch/powerpc