Fix parsing of legacy engine config XML files am: bada1f5e01

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/3391045

Change-Id: I94c137cf574aabb5a4725be24ec6cc8b8e8e52d9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>