Revert "Remove unnecessary signatures from arm64_to_x86_64 libc custom trampolines"

This reverts commit dc75bc4eaa89c55f6531732041ebcb9cb2187093.

Reason for revert: Dependency of another reverted change ag/34924375
Bug: 433437617

Change-Id: Id4df79fc443ae46f73008d8837aae3f512851fb9
1 file changed