Add Trusty rules.mk for libfdt am: 159d7b1955 am: cd8c7ed97d am: cdb45e721d

Original change: https://android-review.googlesource.com/c/platform/external/dtc/+/1976531

Change-Id: I9ba51beb30264bff945b024317b35d3b6511e135
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>