llvm_tools: remove unused `patch_cmd` arg

This makes `cros lint` happy.

BUG=b:332589934
TEST=repo upload

Change-Id: Ic0b15dd0829f731b3387ca6b3df6dbca5688ea93
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/5420773
Commit-Queue: George Burgess <gbiv@chromium.org>
Tested-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Jordan Abrahams-Whitehead <ajordanr@google.com>
2 files changed