cpuidle: pseries: Fixup CEDE0 latency only for POWER10 onwards
Bugzilla: http://bugzilla.redhat.com/2029870
Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=41797267
Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/
Tested by Kalpana Shetty(IBM)
Signed-off-by: gwalbon gwalbon@redhat.com