Rocky Swift and Ankur Banerjee By Rocky Swift and Ankur Banerjee TOKYO, July 10 (Reuters) - Japan is calling its capital home, a move investors say will ripple across markets, could finally lift the yen and send money into the prime minister's artificial intelligence ambitions. On Friday, Japanese Finance Minister Satsuki Katayama floated an idea to encourage the $1.8 trillion Government Pension Investment Fund (GPIF) and other retirement vehicles to increase their holdings of domestic assets.