[pvmfw] Introduce FdtValidationError during the FDT validation am: abc7d63b9e am: 053c53a250

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2624551

Change-Id: Ic1f48d6aa9be93bb881fef6990880e431e67fe65
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>