Do not remove reference dumps before building new dumps

Adding or removing the dump files cause soong to regenerate the
ninja files, which takes a few minutes for every product.
create_reference_dumps.py makes "findlsdumps" and the lsdumps paths.
These targets do not trigger ABI diff. Thus it is not necessary to
remove the reference dumps before building new dumps.

Test: ./create_reference_dumps.py
Bug: 255702405
Change-Id: I4f4a43476d7a9c46d41ef237b846547ed41c7c04
1 file changed