Add metadata files and licenses; link AOSP libs

This removes compiler-rt, libfdt, zlib from ARM-TF and replaces
them with AOSP-equivalents.  Plat/ST was simply removed from the
source.

BUG: 137954390
Test: local build and boot on the rockpi4b
Change-Id: Ib1d53ef0923abc12a0881940839d2829ed00aa91
74 files changed