Update runtime/interface.h file for P9
Update runtime/interface.h file for P9

RTC:153310
Change-Id: I484592015ff157a45d36d6c4b16350cbd45baf5d
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/23680
Tested-by: Jenkins Server
Tested-by: FSP CI Jenkins
Reviewed-by: Martin Gloff <df0a4963746ae04ab678d064fccc7ee68adfd751@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>

open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot