xen/arm: Implement workaround for Cortex A-57 and Cortex A72 AT speculate

xen/arm: Implement workaround for Cortex A-57 and Cortex A72 AT speculate

Both Cortex-A57 (erratum 1319537) and Cortex-A72 (erratum 1319367) can
end with corrupted TLBs if they speculate an AT instruction while S1/S2
system registers in inconsistent state.

The workaround is the same as for Cortex A-76 implemented by commit
a18be06aca "xen/arm: Implement workaround for Cortex-A76 erratum 1165522",
so it is only necessary to plumb in the cpuerrata framework.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>