scripts: gen-doc: fix sof workspace venv

Workspace venv should be in top level SOF workspace directory since
it also has to be used for pip installation of SOF docs dependecies
and not just zephyr build python packages.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

scripts/gen-doc.sh

@@ -15,7 +15,7 @@ if [ ! -z "$ZEPHYR_BASE" ]; then
     VENV_DIR="$ZEPHYR_BASE/.venv"
     echo "Using Zephyr environment at $ZEPHYR_BASE"
 elif [ ! -z "$SOF_WORKSPACE" ]; then
-    VENV_DIR="$SOF_WORKSPACE/zephyr/.venv"
+    VENV_DIR="$SOF_WORKSPACE/.venv"
     echo "Using SOF/Zephyr environment at $SOF_WORKSPACE"
 else
     # fallback to the zephyr default from the getting started guide