trusty: Fix build after v2.8 merge am: c4150dcaa6

Original change: https://android-review.googlesource.com/c/trusty/external/trusted-firmware-a/+/2628830

Change-Id: I366046d700225f6430c30d45b952ed0b2755f2da
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>