Updates default BASE_DIR path for SOF workspace

Changes the default BASE_DIR path to a more specific directory
("/home/sof/work/sof.git") when the SOF_WORKSPACE environment
variable is unset, improving clarity and consistency.

Signed-off-by: Christopher Turner <christopher.g.turner@intel.com>

Author: cgturner1

scripts/build-alsa-tools.sh

@@ -22,7 +22,7 @@ declare -a COMMIT_ID=(
 # Directory where repositories will be cloned/updated.
 if [[ -z "$SOF_WORKSPACE" ]]; then
   # Environment variable is empty or unset so use default
-  BASE_DIR="$HOME/work/sof"
+  BASE_DIR="/home/sof/work/sof.git"
 else
   # Environment variable exists and has a value
   BASE_DIR="$SOF_WORKSPACE"