cbuildbot: Include all image*.bin files for firmware_from_source.
cbuildbot: Include all image*.bin files for firmware_from_source.

In future the firmware images may have undetermined name (Ex,
firmware-$BOARD.bin) so we should not trust hard-coded fixed names anymore.

BUG=chrome-os-partner:10025
TEST=trybot:
     http://chromegw.corp.google.com/i/chromiumos.tryserver/builders/link-release/builds/33

Change-Id: I6b5d9c26cd0f73316fc220e28323a782b260bf4b
Reviewed-on: https://gerrit.chromium.org/gerrit/25162
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Commit-Ready: Hung-Te Lin <8a7fce4940baad93a69f5073b383c85deed9d9c4@chromium.org>
Tested-by: Hung-Te Lin <8a7fce4940baad93a69f5073b383c85deed9d9c4@chromium.org>

bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,zhang0137/chromite,chadversary/chromiumos.chromite,zhang0137/chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,coreos/chromite,coreos/chromite,zhang0137/chromite,bpsinc-native/src_third_party_chromite