build_image: Remove build directory creation

Build directory is created in python. Hence remove it in shell script.

BUG=b:234765273
TEST=CQ

Cq-Depend: chromium:3732429
Change-Id: I1ffc22c216bedd348b1a4c6b8338218b3dfd5c5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3732667
Commit-Queue: Ram Chandrasekar <rchandrasekar@google.com>
Tested-by: Ram Chandrasekar <rchandrasekar@google.com>
Reviewed-by: Cindy Lin <xcl@google.com>
3 files changed