generate_au_zip.py: Place ELF files in .elf/ sub-directory.

This patch prevents e2cp from being renamed to e2cp.elf by placing it
inside the directory .elf in the au-generator.zip file.

CQ-DEPEND=CL:296424
BUG=chromium:526753
TEST=Ran cros_generate_update_payload from an old image in the generated zip file environment.

Change-Id: I8bb1ebb3d855441108f898b9b7cdb769e520452f
Reviewed-on: https://chromium-review.googlesource.com/296463
Reviewed-by: Matthew Yuan <matthewyuan@chromium.org>
Tested-by: Matthew Yuan <matthewyuan@chromium.org>
1 file changed