tast: add no_downloads_bind_mount to software_deps

This flag is used to skip download_bind_mount, so we can run
tast tests to check the migration from ~/Downloads to
~/MyFiles/Downloads.

BUG=b:327273065
TEST=CQ

Change-Id: I68875f2aa1c50614dcef27a7be607b40ea404a87
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/tast/+/5330346
Commit-Queue: Wenbo Jie <[email protected]>
Reviewed-by: Ben Reich <[email protected]>
Tested-by: Wenbo Jie <[email protected]>
diff --git a/docs/test_dependencies.md b/docs/test_dependencies.md
index af2a115..f01abcb 100644
--- a/docs/test_dependencies.md
+++ b/docs/test_dependencies.md
@@ -162,6 +162,7 @@
 * `no_asan` - Build was not built with Address Sanitizer. Similar to `aslr`.
 * `no_borealis_host` - Boards which is not designed to host borealis.
 * `no_chrome_dcheck` - Chrome/Chromium was not built with dcheck enabld.
+* `no_downloads_bind_mount` - Disable Downloads bind mount and migrate files from ~/Downloads to ~/MyFiles/Downloads.
 * `no_eth_loss_on_reboot` - Board does not lose ethernet on reboot. Context: b/178529170
 * `no_iioservice` - Build was not built with CrOS IIO Service.
 * `no_msan` - Build was not built with Memory Sanitizer.