ARM: KVM: invalidate BTB on guest exit for Cortex-A12/A17

In order to avoid aliasing attacks against the branch predictor,
let's invalidate the BTB on guest exit. This is made complicated
by the fact that we cannot take a branch before invalidating the
BTB.

We only apply this to A12 and A17, which are the only two ARM
cores on which this useful.

Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Russell King <[email protected]>
Boot-tested-by: Tony Lindgren <[email protected]>
Reviewed-by: Tony Lindgren <[email protected]>

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