arm64: Add MIDR for KRYO5s in kpti_safe_list

KRYO5S cpus are not affected by meltdown issue. But sysfs entry
/sys/devices/system/cpu/vulnerabilities/meltdown shows it as
vulnerable. Fix this by adding MIDR_KRYO5S to kpti_safe_list.

Change-Id: Id4da784d12b94297b97ce3aeb42e2fe0711367e7
Signed-off-by: Prateek Sood <prsood@codeaurora.org>