Remove string substitution from ABI dump scripts

header-abi-dumper writes relative paths to the dumps. It is not
necessary for the scripts to replace the absolute paths. The number of
file operations can be reduced.

Test: ./create_reference_dumps.py
Test: ./test.py
Test: ./gen_all.py
Bug: 154177636
Change-Id: I25e54f3555146138b2dcddb387b49eb834a1c64d
4 files changed