Hewlett-Packard (NYSE:HPQ) plans to announce a major restructuring plan today that will include the merger between its PC and printing divisions.Included in the restructuring plans is the firing of chief V.J. Joshi, sources told AllThingsD.Both of the HP units posted weak revenue in its fiscal Q1, as each fights to offset cannibalization from competing technologies, tablets cutting into PC sales and online photo sharing cutting into the printing figures.