Export headers using cc_library_headers am: 393ff671f0 am: 80ca19568b am: b862b6fcfa am: 2af86b9145

Original change: https://android-review.googlesource.com/c/platform/external/arm-trusted-firmware/+/2604251

Change-Id: I929911dd925e6c5c19d07c8aa419b325318fafe6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>