enter_chroot: disable depot_tools updates inside the SDK

We update the depot_tools checkouts ourselves through our manifest,
so there's no need or desire for this code to try and manage it.

BUG=chromium:1166896
TEST=CQ passes

Change-Id: I8048fd2e5f30f4d4c512a47118e07c799d63e075
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2631045
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
1 file changed