AMC’s “Better Call Saul” set a new record for a cable series premiere audience Sunday night, drawing 6.9 million viewers. That’s down from the 10.3 million who watched the finale of its parent series, “Breaking Bad,” but it’s well above the audience “Breaking Bad” had averaged for every episode before the finale. As late as the end of its fourth season, “Breaking Bad” averaged fewer than two million viewers. “Saul” stars Bob Odenkirk as Saul Goodman, the sleazy lawyer who facilitated Bryan Cranston’s Walter White in “Bad.”