juno: Fix the number of rates returns for triplet rate array format
Created by: sudeep-holla
As per the specification, the number of rates should be 3 if the triplet rate array format(bit[12]) is set.
Signed-off-by: Sudeep Holla sudeep.holla@arm.com Change-Id: Ia7c3299b8327ec0a50923941c1e9a11e80fcc504