[Bug] Hexagon tests erroneously say "Hexagon support not enabled" when no ANDROID_SERIAL_NUMBER environment variable is set

[supersat]

Previously, Hexagon tests would say "Skip hardware test since ANDROID_SERIAL_NUMBER is not set." if the ANDROID_SERIAL_NUMBER environment variable wasn't set. However, it seems as of #11294, it now says "Hexagon support not enabled", implying that TVM wasn't built with Hexagon support enabled.

Expected behavior

A warning saying ANDROID_SERIAL_NUMBER isn't set.

Actual behavior

A warning saying "Hexagon support not enabled."

Environment

Ubuntu 20.04
TVM main branch @ 4a769c1

Steps to reproduce

Build TVM with Hexagon support. Run any Hexagon test without an ANDROID_SERIAL_NUMBER environment variable.

[supersat]

This was fixed with PR #12504