scripts: pixel: Make build-desc-fingerprint.sh commit changes

Tests: cd lineage/scripts/pixel && ./build-desc-fingerprint.sh coral flame
Notes: No additional issues added in `shellcheck`
Change-Id: I1810ad996d727337b73c6959aaa37bdcaf0d5e5b

pixel/build-desc-fingerprint.sh

@@ -58,6 +58,7 @@ main() {
     local ds="${devices[@]}"
   fi
 
+  # Update the makefiles
   for d in ${ds}; do
     (
       local dv="${vars_path}/${d}"
@@ -67,6 +68,18 @@ main() {
       sed -i "s/${prev_build_number}/${build_number}/g" "${mk}"
     )
   done
+
+  # Commit the changes
+  for d in ${ds}; do
+    (
+      local dv="${vars_path}/${d}"
+      source "${dv}"
+      cd "${top}/device/google/${d}"
+      if [[ -n "$(git status --porcelain)" ]]; then
+        git commit -a -m "Update fingerprint/build description from ${build_id}"
+      fi
+    )
+  done
 }
 
 ### RUN PROGRAM ###