The Los Angeles Lakers are aiming for roster upgrades this offseason with eyes on several targets across multiple positions.With a decent cap space, which could get even better, and several tradable assets, the Lakers will chase value in any trade.According to Athlon Sports writer Nathaniel Holloway, one option for the Lakers involves pursuing Dallas Mavericks star Kyrie Irving in a blockbuster trade — although the Mavericks may be hesitant to d…