TOKYO, March 9 : Pressure from activists, or the fear of being targeted by them, is pushing Japanese companies to accelerate governance reforms by unwinding the cross-shareholdings that have underpinned relationships for decades. Major firms including Toyota Motor and Nintendo have moved to unwind cross-shareholdings, Reuters has reported, with the "Super Mario" maker later announcing a sale. The practice of companies owning stakes in each other is unusual in the West but common in Japan where