arm64: Enable branch predictor hardening on kryo4xx gold cores

Add the kryo4xx gold cores to the list of CPUs that need
to have the SMCCC workaround for branch predictor
hardening.

Change-Id: I9b7f132316e45d592f25029b34e32bb680db08b7
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>