Don't link with libbinder itself just for the headers

By linking with libbinder.so, it ends up being an actual dependency
for anything that links with android.hidl.token@1.0-utils, which
results in it being copied into APEX files when it shouldn't be.
Use libbinder_headers instead.

Test: build
Bug: 139016109
Change-Id: If448572daa5434a71a7b8a5499424a2175123425
1 file changed