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

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

Change-Id: I6ebe0342a56613e53625298aafa20a44a7bc5b8e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>