auto_llvm_bisection: remove `cros_sdk` invocation

`cros buildresult` is available outside of the chroot, and the
`cros_sdk` here might eat users' Ctrl-Cs. In either case, since `cros
buildresult` relies on chromite sources from the tree you're currently
in, entering the chroot seemingly buys us nothing here.

BUG=b:187794504
TEST=Unittests

Change-Id: Id8f7332c850a52818f81c37c4b6ccf45e02cb293
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/4634278
Reviewed-by: Bob Haarman <inglorion@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
Tested-by: George Burgess <gbiv@chromium.org>
2 files changed