mako: Enable Krait Retention.

Add SPM sequences to do Krait retention for 8960,8930
and 8064. Also added a new rpmrs level containing the
latencies and power measurements for this new low power
state.

Change-Id: Id7c965dd69da43952aa4d5ec4484b0bc29c2c883
Signed-off-by: jawz101 <jrdn.wms@gmail.com>