Wichita, Kan.-based Cessna Aircraft said it was laying off about 900 workers, or 16% of its work force, and suspending piston-engine airplane production for more than a year . . . Vons Cos. is the new name of HMI Holdings, which was formed in January after a leveraged buyout of the Household Merchandising division of Household International; the newly named company's primary division is Vons Grocery Co. . . . Deere & Co. said its board of directors voted to reduce the company's regular quarterly dividend to 12.5 cents per share from 25 cents and delared a dividend at the lower rate payable Aug. 1 to stockholders of record on June 30 . . . Celanese Corp. reported that its board of directors authorized it to purchase up to 600,000 shares of its common stock on the open market . . . Dayton Hudson shareholders approved an increase in the authorized number of common shares to 500 million from 160 million and in the number of preferred shares to 5 million from 200,000 . . . The American Electronics Assn. reported that sales of American-made electronics products and services were 4% lower in the first quarter of 1986 than in the same quarter last year.