tests: Separate mock archive.c and bitmap.c

In CL:3253135 we split archive.c to two files: archive.c and bitmap.c.
Therefore we should also do the same for the mock functions.

BUG=none
TEST=make unit-tests -j
BRANCH=none

Change-Id: I72804f268282e6a89f7b0b177c8d6f77d5f76918
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/3642983
Commit-Queue: Hsuan Ting Chen <roccochen@chromium.org>
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
3 files changed