power_domain: Handle power_domain set_state error
Created by: raphaelgault
While transitioning a power domain to a particular state, we should not expect any driver input if the driver has failed to initiate a power domain transition.
Change-Id: If9b03221b30251f01855e220e5ef2a80f5c7ef80 Signed-off-by: Raphael Gault raphael.gault@arm.com