xen/arm64: Implement branch predictor hardening for affected Cortex-A CPUs

xen/arm64: Implement branch predictor hardening for affected Cortex-A CPUs

Cortex-A57, A72, A73 and A75 are susceptible to branch predictor
aliasing and can theoritically be attacked by malicious code.

This patch implements a PSCI-based mitigation for these CPUs when
available. The call into firmware will invalidate the branch predictor
state, preventing any malicious entries from affection other victim
contexts.

Ported from Linux git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git
branch kpti.

 Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
 Signed-off-by: Will Deacon <will.deacon@arm.com>
This is part of XSA-254.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>