This patch gets the PReP Boot partition UUID when performing a local boot
partition image deployment on ppc64* hardware.
Depends-On: I8f9748dd58146bfb2411c229b02969e0faf18222
Change-Id: I2bc9f13ec605de7b7b96d96a1a4edebee0af76dc
Story: #1749057
Task: #22995