utils: hooks: pre-push: Accept Acked-by in addition to Reviewed-by

Allow pushing commits that have no Reviewed-by tag but have at least one
Acked-by tag.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

utils/hooks/pre-push

@@ -57,10 +57,10 @@ do
 			errors=$((errors+1))
 		fi
 
-		# 3. A Reviewed-by is required.
-		if ! echo "$msg" | grep -q '^Reviewed-by: '
+		# 3. A Reviewed-by or Acked-by is required.
+		if ! echo "$msg" | grep -q '^\(Reviewed\|Acked\)-by: '
 		then
-			echo >&2 "No Reviewed-by in commit $commit"
+			echo >&2 "No Reviewed-by or Acked-by in commit $commit"
 			errors=$((errors+1))
 		fi
 	done