juno: Fix juno_system notification handler

Merged Darryl Green requested to merge github/fork/CJKay/master into master

Created by: CJKay

The Juno System module is currently returning FWK_E_PARAM from its notification handler in cases where it should be returning FWK_SUCCESS. This commit fixes this issue and simplifies the notification handling logic.

Change-Id: If50906186603f6f119f9c18687ef664947ebf0b4 Signed-off-by: Chris Kay chris.kay@arm.com

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